Fixed #11471: Fixed typo in a comment in admin options.py. Thanks adamv.

    def get_action(self, action):

        """

        Return a given action from a parameter, which can either be a calable,

        Return a given action from a parameter, which can either be a callable,

        or the name of a method on the ModelAdmin.  Return is a tuple of

        (callable, name, description).

        """