Fix informal-RST in docstrings for clean autodoc

The new `api/` reference pages surfaced 22 docutils warnings from
informal reST in public docstrings; fix the markup so the docs
build is warning-free (24 -> 0), clearing the path to a future
`-W`/`nitpicky` flip in CI.

Deats (docstring content only; no code/signature changes),
- give bullet lists a blank line + base-column indent (`Context`,
  `Context.cancel_called`/`.cancelled_caught`/ `.outcome`,
  `ActorNursery.cancel_called`, `query_actor`,
  `open_crash_handler`),
- demote the under-short `Behaviour:` underline in `Context.cancel`
  to a `**bold**` label,
- close an unbalanced backtick in the `wait_for_actor` summary and
  use the `` `role`\ s `` escaped-plural idiom where a role was
  pluralized (`gather_contexts`, `mk_pdb`, `MsgCodec`, msg `Error`,
  `open_context_from_portal`),
- make the `|_` method-tree in `ContextCancelled.canceller` a
  literal block (the bare `|` was read as a substitution ref),
- same blank-line fix for the `#318` entry in `NEWS.rst`.

(this patch was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code

NEWS.rst

@@ -78,6 +78,7 @@ Bug Fixes
   for ``asyncio``-side errors to not propagate due to a race condition.
 
   The implementation fix summary is:
+
   - add state to signal the end of the ``trio`` side task to be
     read by the ``asyncio`` side and always cancel any ongoing
     task in such cases.

tractor/_context.py

@@ -135,19 +135,21 @@ class Context:
     communication context.
 
     (We've also considered other names and ideas:
-     - "communicating tasks scope": cts
-     - "distributed task scope": dts
-     - "communicating tasks context": ctc
 
-     **Got a better idea for naming? Make an issue dawg!**
+    - "communicating tasks scope": cts
+    - "distributed task scope": dts
+    - "communicating tasks context": ctc
+
+    **Got a better idea for naming? Make an issue dawg!**
     )
 
     NB: This class should **never be instatiated directly**, it is
     allocated by the runtime in 2 ways:
-     - by entering `Portal.open_context()` which is the primary
-       public API for any "parent" task or,
-     - by the RPC machinery's `._rpc._invoke()` as a `ctx` arg
-       to a remotely scheduled "child" function.
+
+    - by entering `Portal.open_context()` which is the primary
+      public API for any "parent" task or,
+    - by the RPC machinery's `._rpc._invoke()` as a `ctx` arg
+      to a remotely scheduled "child" function.
 
     AND is always constructed using the below `mk_context()`.
 
@@ -443,6 +445,7 @@ class Context:
         '''
         Records whether cancellation has been requested for this context
         by a call to  `.cancel()` either due to,
+
         - an explicit call by some local task,
         - or an implicit call due to an error caught inside
           the `Portal.open_context()` block.
@@ -554,6 +557,7 @@ class Context:
         Only as an FYI, in the "child" side case it can also be
         set but never is readable by any task outside the RPC
         machinery in `._invoke()` since,:
+
         - when a child side calls `.cancel()`, `._scope.cancel()`
           is called immediately and handled specially inside
           `._invoke()` to raise a `ContextCancelled` which is then
@@ -1033,8 +1037,8 @@ class Context:
         `._scope.cancel()` and delivering an `ContextCancelled`
         ack msg in reponse.
 
-        Behaviour:
-        ---------
+        **Behaviour:**
+
         - after the far end cancels, the `.cancel()` calling side
           should receive a `ContextCancelled` with the
           `.canceller: tuple` uid set to the current `Actor.aid.uid`.
@@ -1505,7 +1509,8 @@ class Context:
         TODO->( this is doc-driven-dev content not yet actual ;P )
 
         The final "outcome" from an IPC context which can be any of:
-        - some `outcome.Value` which boxes the returned output from the peer task's 
+
+        - some `outcome.Value` which boxes the returned output from the peer task's
           `@context`-decorated remote task-as-func, or
         - an `outcome.Error` wrapping an exception raised that same RPC task
           after a fault or cancellation, or
@@ -2066,7 +2071,7 @@ async def open_context_from_portal(
     allows for deterministic setup and teardown of a remotely
     scheduled task in another remote actor. Once opened, the 2 now
     "linked" tasks run completely in parallel in each actor's
-    runtime with their enclosing `trio.CancelScope`s kept in
+    runtime with their enclosing `trio.CancelScope`\\ s kept in
     a synced state wherein if either side errors or cancels an
     equivalent error is relayed to the other side via an SC-compat
     IPC protocol.

tractor/_exceptions.py

@@ -823,12 +823,13 @@ class ContextCancelled(RemoteActorError):
 
         - (simulating) an IPC transport network outage
         - a (malicious) pkt sent specifically to cancel an actor's
-          runtime non-gracefully without ensuring ongoing RPC tasks are 
-          incrementally cancelled as is done with:
-          `Actor`
-          |_`.cancel()`
-          |_`.cancel_soon()`
-          |_`._cancel_task()`
+          runtime non-gracefully without ensuring ongoing RPC tasks are
+          incrementally cancelled as is done with::
+
+              `Actor`
+              |_`.cancel()`
+              |_`.cancel_soon()`
+              |_`._cancel_task()`
 
         '''
         value: tuple[str, str]|None = self._ipc_msg.canceller

tractor/devx/debug/_post_mortem.py

@@ -321,6 +321,7 @@ def open_crash_handler(
     `typer` users so they can quickly wrap cmd endpoints which get
     automatically wrapped to use the runtime's `debug_mode: bool`
     AND `pdbp.pm()` around any code that is PRE-runtime entry
+
     - any sync code which runs BEFORE the main call to
       `trio.run()`.
 

tractor/devx/debug/_repl.py

@@ -187,7 +187,7 @@ def mk_pdb() -> PdbREPL:
 
     FURTHER, the `pdbp.Pdb` instance is configured to be `trio`
     "compatible" from a SIGINT handling perspective; we mask out
-    the default `pdb` handler and instead apply `trio`s default
+    the default `pdb` handler and instead apply `trio`\\ s default
     which mostly addresses all issues described in:
 
      - https://github.com/python-trio/trio/issues/1155

tractor/discovery/_api.py

@@ -253,6 +253,7 @@ async def query_actor(
     listening @ `regaddr`.
 
     Yields a `tuple` of `(addr, reg_portal)` where,
+
     - `addr` is the transport protocol (socket) address or `None` if
       no entry under that name exists,
     - `reg_portal` is the `Portal` (or `LocalPortal` when the
@@ -439,7 +440,7 @@ async def wait_for_actor(
 ) -> AsyncGenerator[Portal, None]:
     '''
     Wait on at least one peer actor to register `name` with the
-    registrar, yield a `Portal to the first registree.
+    registrar, yield a `Portal` to the first registree.
 
     '''
     actor: Actor = current_actor()

tractor/msg/_codec.py

@@ -371,7 +371,7 @@ class MsgCodec(Struct):
     A IPC msg interchange format lib's encoder + decoder pair.
 
     Pretty much nothing more then delegation to underlying
-    `msgspec.<interchange-protocol>.Encoder/Decoder`s for now.
+    `msgspec.<interchange-protocol>.Encoder/Decoder`\\ s for now.
 
     '''
     _enc: msgpack.Encoder

tractor/msg/types.py

@@ -453,7 +453,7 @@ class Error(
     # omit_defaults=True,
 ):
     '''
-    A pkt that wraps `RemoteActorError`s for relay and raising.
+    A pkt that wraps `RemoteActorError`\\ s for relay and raising.
 
     Fields are 1-to-1 meta-data as needed originally by
     `RemoteActorError.msgdata: dict` but now are defined here.

tractor/runtime/_supervise.py

@@ -252,6 +252,7 @@ class ActorNursery:
         '''
         Records whether cancellation has been requested for this
         actor-nursery by a call to  `.cancel()` either due to,
+
         - an explicit call by some actor-local-task,
         - an implicit call due to an error/cancel emited inside
           the `tractor.open_nursery()` block.

tractor/trionics/_mngrs.py

@@ -120,12 +120,12 @@ async def gather_contexts(
     None,
 ]:
     '''
-    Concurrently enter a sequence of async context managers (`acm`s),
+    Concurrently enter a sequence of async context managers (`acm`\\ s),
     each scheduled in a separate `trio.Task` and deliver their
-    unwrapped `yield`-ed values in the same order once all `@acm`s
+    unwrapped `yield`-ed values in the same order once all `@acm`\\ s
     in every task have entered.
 
-    On exit, all `acm`s are subsequently and concurrently exited with
+    On exit, all `acm`\\ s are subsequently and concurrently exited with
     **no order guarantees**.
 
     This function is somewhat similar to a batch of non-blocking