code: def remove_room_alias(self, room_alias):
          
          try:
              self.api.remove_room_alias(room_alias)
              return True
          except MatrixRequestError:
              return False
docs: Remove mapping of an alias
  
          Args:
              room_alias(str): The alias to be removed.
  
          Returns:
              bool: True if the alias is removed, False otherwise.