docs: def update(self, text, revision=None):
          """
          Modifies the internal state based a change to the content and returns
          the sets of words added and removed.
  
          :Parameters:
              text : str
                  The text content of a revision
              revision : `mixed`
                  Revision metadata
  
          :Returns:
              A triple of lists:
  
              current_tokens : `list` ( :class:`~mwpersistence.Token` )
                  A sequence of Tokens representing the revision that was just
                  processed.
              tokens_added : `list` ( :class:`~mwpersistence.Token` )
                  Tokens that were added while updating state.
              tokens_removed : `list` ( :class:`~mwpersistence.Token` )
                  Tokens that were removed while updating state.
          """
          return self._update(text=text, revision=revision)