Fix various reference issues in documentation

Co-Authored-By: Riley Shaw <30989490+ShineyDev@users.noreply.github.com>

discord/ext/commands/cog.py

@@ -334,7 +334,7 @@ class Cog(metaclass=CogMeta):
 
     @_cog_special_method
     def cog_check(self, ctx):
-        """A special method that registers as a :func:`commands.check`
+        """A special method that registers as a :func:`~discord.ext.commands.check`
         for every command and subcommand in this cog.
 
         This function **can** be a coroutine and must take a sole parameter,