code: def register(self, name, content, description=None):
          
          return self.__app.documents.register(name, content, self._plugin, description)
docs: Register a new document.
  
          :param content: Content of this document. Jinja and rst are supported.
          :type content: str
          :param name: Unique name of the document for documentation purposes.
          :param description: Short description of this document