Add notes warning that fetch_ methods are api calls

Also recommends using cache attributes/methods instead

discord/client.py

@@ -861,6 +861,10 @@ class Client:
             Using this, you will only receive :attr:`Guild.owner`, :attr:`Guild.icon`,
             :attr:`Guild.id`, and :attr:`Guild.name` per :class:`Guild`.
 
+        .. note::
+
+            This method is an API call. For general usage, consider :attr:`guilds` instead.
+
         All parameters are optional.
 
         Parameters
@@ -912,6 +916,10 @@ class Client:
             Using this, you will not receive :attr:`Guild.channels`, :class:`Guild.members`,
             :attr:`Member.activity` and :attr:`Member.voice` per :class:`Member`.
 
+        .. note::
+
+            This method is an API call. For general usage, consider :meth:`get_guild` instead.
+
         Parameters
         -----------
         guild_id: :class:`int`
@@ -1099,6 +1107,10 @@ class Client:
         with the user to get this information, however many operations
         do require that you do.
 
+        .. note::
+
+            This method is an API call. For general usage, consider :meth:`get_user` instead.
+
         Parameters
         -----------
         user_id: :class:`int`

discord/guild.py

@@ -931,6 +931,10 @@ class Guild(Hashable):
 
         Retreives a :class:`Member` from a guild ID, and a member ID.
 
+        .. note::
+
+            This method is an API call. For general usage, consider :meth:`get_member` instead.
+
         Parameters
         -----------
         member_id: :class:`int`
@@ -1149,6 +1153,10 @@ class Guild(Hashable):
 
         Retrieves all custom :class:`Emoji`\s from the guild.
 
+        .. note::
+
+            This method is an API call. For general usage, consider :attr:`emojis` instead.
+
         Raises
         ---------
         HTTPException
@@ -1167,6 +1175,11 @@ class Guild(Hashable):
 
         Retrieves a custom :class:`Emoji` from the guild.
 
+        .. note::
+
+            This method is an API call.
+            For general usage, consider iterating over :attr:`emojis` instead.
+
         Parameters
         -------------
         emoji_id: :class:`int`