code: def wiki_update(self, title, new_title=None, page_body=None):
          
          params = {
              'title': title,
              'wiki_page[title]': new_title,
              'wiki_page[body]': page_body
              }
          return self._get('wiki/update', params, method='PUT')
docs: Action to lets you update a wiki page (Requires login) (UNTESTED).
  
          Parameters:
              title (str): The title of the wiki page to update.
              new_title (str): The new title of the wiki page.
              page_body (str): The new body of the wiki page.