code: def update_wiki(self, update_parameters, wiki_identifier, project=None):
          
          route_values = {}
          if project is not None:
              route_values['project'] = self._serialize.url('project', project, 'str')
          if wiki_identifier is not None:
              route_values['wikiIdentifier'] = self._serialize.url('wiki_identifier', wiki_identifier, 'str')
          content = self._serialize.body(update_parameters, 'WikiUpdateParameters')
          response = self._send(http_method='PATCH',
                                location_id='288d122c-dbd4-451d-aa5f-7dbbba070728',
                                version='5.1-preview.2',
                                route_values=route_values,
                                content=content)
          return self._deserialize('WikiV2', response)
docs: UpdateWiki.
          [Preview API] Updates the wiki corresponding to the wiki Id or name provided using the update parameters.
          :param :class:`<WikiUpdateParameters> <azure.devops.v5_1.wiki.models.WikiUpdateParameters>` update_parameters: Update parameters.
          :param str wiki_identifier: Wiki name or Id.
          :param str project: Project ID or project name
          :rtype: :class:`<WikiV2> <azure.devops.v5_1.wiki.models.WikiV2>`