Updates javadoc

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/filter/NettyRoutingFilter.java

@@ -237,7 +237,7 @@ public class NettyRoutingFilter implements GlobalFilter, Ordered {
 	 * timeout configuration.
 	 * @param route the current route.
 	 * @param exchange the current ServerWebExchange.
-	 * @return
+	 * @return the configured HttpClient.
 	 */
 	protected HttpClient getHttpClient(Route route, ServerWebExchange exchange) {
 		Object connectTimeoutAttr = route.getMetadata().get(CONNECT_TIMEOUT_ATTR);

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/filter/WebsocketRoutingFilter.java

@@ -215,7 +215,7 @@ public class WebsocketRoutingFilter implements GlobalFilter, Ordered {
 
 				/**
 				 * Copy subProtocols so they are available downstream.
-				 * @return
+				 * @return available subProtocols.
 				 */
 				@Override
 				public List<String> getSubProtocols() {