Added note to exception when missing field in SpotPair class

piker/brokers/binance/api.py

@@ -433,7 +433,11 @@ class Client:
                 item['filters'] = filters
 
             pair_type: Type = PAIRTYPES[venue]
+            try:
                 pair: Pair = pair_type(**item)
+            except Exception as e:
+                e.add_note(f'\nDon\'t panic, check out this https://binance-docs.github.io/apidocs/spot/en/#exchange-information')
+                raise
             pair_table[pair.symbol.upper()] = pair
 
             # update an additional top-level-cross-venue-table