Clarify connect() requires Intents.voice_states

discord/abc.py

@@ -1633,6 +1633,8 @@ class Connectable(Protocol):
         Connects to voice and creates a :class:`VoiceClient` to establish
         your connection to the voice server.
 
+        This requires :attr:`Intents.voice_states`.
+
         Parameters
         -----------
         timeout: :class:`float`