docs: def subnet_update(auth=None, **kwargs):
      '''
      Update a subnet
  
      name_or_id
          Name or ID of the subnet to update
  
      subnet_name
          The new name of the subnet
  
      enable_dhcp
          Set to ``True`` if DHCP is enabled and ``False`` if disabled
  
      gateway_ip
          The gateway IP address. When you specify both allocation_pools and
          gateway_ip, you must ensure that the gateway IP does not overlap with
          the specified allocation pools.
  
      disable_gateway_ip : False
          Set to ``True`` if gateway IP address is disabled and False if enabled.
          It is not allowed with ``gateway_ip``.
  
      allocation_pools
          A list of dictionaries of the start and end addresses for the
          allocation pools.
  
      dns_nameservers
          A list of DNS name servers for the subnet
  
      host_routes
          A list of host route dictionaries for the subnet
  
      .. code-block:: bash
  
          salt '*' neutronng.subnet_update name=subnet1 subnet_name=subnet2
          salt '*' neutronng.subnet_update name=subnet1 dns_nameservers='["8.8.8.8", "8.8.8.7"]'
  
      '''
      cloud = get_operator_cloud(auth)
      kwargs = _clean_kwargs(**kwargs)
      return cloud.update_subnet(**kwargs)