One more instance of modified method name in Mono

Author: rstoyanchev

spring-messaging/src/main/java/org/springframework/messaging/tcp/reactor/ReactorNettyTcpClient.java

@@ -195,7 +195,7 @@ public ListenableFuture<Void> shutdown() {
 
 		ChannelGroupFuture close = this.channelGroup.close();
 		Mono<Void> completion = FutureMono.from(close)
-				.doAfterTerminate((x, e) -> {
+				.doOnSuccessOrError((x, e) -> {
 					// TODO: https://github.com/reactor/reactor-netty/issues/24
 					shutdownGlobalResources();