Revert ":memo: fix typo in Client.get_poll docstring"

This reverts commit 0aba361.

Author: Paillat-dev

discord/client.py

@@ -1119,7 +1119,7 @@ def get_poll(self, id: int, /) -> Poll | None:
 
         Returns
         -------
-        Optional[:class:`Poll`]
+        Optional[:class:`.Poll`]
             The poll or ``None`` if not found.
         """
         return self._connection.get_poll(id)