code: public P2SVpnGatewayInner beginUpdateTags(String resourceGroupName, String gatewayName) {
          return beginUpdateTagsWithServiceResponseAsync(resourceGroupName, gatewayName).toBlocking().single().body();
      }
docs: Updates virtual wan p2s vpn gateway tags.
  
  @param resourceGroupName The resource group name of the P2SVpnGateway.
  @param gatewayName The name of the gateway.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws ErrorException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the P2SVpnGatewayInner object if successful.