Flip a couple more debug scripts to UDS tpt

For now just as sanity that we're not breaking anything on that
transport backend (since just a little while back there were issues with
crash handling in subs..) when it comes to crash-REPLing.

examples/debugging/root_cancelled_but_child_is_in_tty_lock.py

@@ -24,10 +24,9 @@ async def spawn_until(depth=0):
 
 
 async def main():
-    """The main ``tractor`` routine.
+    '''
-
+    The process tree should look as approximately as follows when the
-    The process tree should look as approximately as follows when the debugger
+    debugger first engages:
-    first engages:
 
     python examples/debugging/multi_nested_subactors_bp_forever.py
     ├─ python -m tractor._child --uid ('spawner1', '7eab8462 ...)
@@ -37,10 +36,11 @@ async def main():
     └─ python -m tractor._child --uid ('spawner0', '1d42012b ...)
        └─ python -m tractor._child --uid ('name_error', '6c2733b8 ...)
 
-    """
+    '''
     async with tractor.open_nursery(
         debug_mode=True,
-        loglevel='warning'
+        loglevel='devx',
+        enable_transports=['uds'],
     ) as n:
 
         # spawn both actors

examples/debugging/shield_hang_in_sub.py

@@ -37,6 +37,7 @@ async def main(
             enable_stack_on_sig=True,
             # maybe_enable_greenback=False,
             loglevel='devx',
+            enable_transports=['uds'],
         ) as an,
     ):
         ptl: tractor.Portal  = await an.start_actor(