[commands] Fix indentation error in commands.bot_has_role docstring.

discord/ext/commands/core.py

@@ -791,6 +791,7 @@ def bot_has_role(name):
     """Similar to :func:`has_role` except checks if the bot itself has the
     role.
     """
+
     def predicate(ctx):
         ch = ctx.message.channel
         if ch.is_private: