Add more explicit description about the sendreplies methods

Co-authored-by: Joel Payne <[email protected]>
(cherry picked from commit praw-dev/praw@a0736f1)

asyncpraw/models/reddit/mixins/inboxtoggleable.py

@@ -8,6 +8,10 @@ class InboxToggleableMixin:
     async def disable_inbox_replies(self):
         """Disable inbox replies for the item.
 
+        .. note::
+
+            This can only apply to items created by the authenticated user.
+
         Example usage:
 
         .. code-block:: python
@@ -30,6 +34,10 @@ async def disable_inbox_replies(self):
     async def enable_inbox_replies(self):
         """Enable inbox replies for the item.
 
+        .. note::
+
+            This can only apply to items created by the authenticated user.
+
         Example usage:
 
         .. code-block:: python