fix(emoji): return type mismatch (#3267)

Co-authored-by: Paillat <paillat@pycord.dev>

Author: vmphase

discord/emoji.py

@@ -364,7 +364,7 @@ def __repr__(self) -> str:
         return f"<AppEmoji id={self.id} name={self.name!r} animated={self.animated}>"
 
     @property
-    def guild(self) -> Guild:
+    def guild(self) -> None:
         """The guild this emoji belongs to. This is always `None` for :class:`AppEmoji`."""
         return None