docs: def add_tags_to_bookmark(self, bookmark_id, tags):
          """
          Add tags to to a bookmark.
  
          The identified bookmark must belong to the current user.
  
          :param bookmark_id: ID of the bookmark to delete.
          :param tags: Comma separated tags to be applied.
          """
          url = self._generate_url('bookmarks/{0}/tags'.format(bookmark_id))
          params = dict(tags=tags)
          return self.post(url, params)