code: def limit(self, count):
          
          return self.__class__(
              self._parent,
              projection=self._projection,
              field_filters=self._field_filters,
              orders=self._orders,
              limit=count,
              offset=self._offset,
              start_at=self._start_at,
              end_at=self._end_at,
          )
docs: Limit a query to return a fixed number of results.
  
          If the current query already has a limit set, this will overwrite it.
  
          Args:
              count (int): Maximum number of documents to return that match
                  the query.
  
          Returns:
              ~.firestore_v1beta1.query.Query: A limited query. Acts as a
              copy of the current query, modified with the newly added
              "limit" filter.