Expand docstring for Member.voice property

The docstring for the Member.voice property now includes a detailed Returns section, clarifying the return type and behavior when the member is not in a voice channel.

Author: Lumabots

discord/member.py

@@ -716,7 +716,13 @@ def guild_permissions(self) -> Permissions:
 
     @property
     def voice(self) -> VoiceState | None:
-        """Returns the member's current voice state."""
+        """Returns the member's current voice state.
+
+        Returns
+        -------
+        Optional[:class:`VoiceState`]
+            The member's voice state or ``None`` if the member is not in a voice channel.
+        """
         return self.guild._voice_state_for(self._user.id)
 
     @property