Doc: update Unix domain sockets section

In Vert.x 5, the Web Client supports Unix domain sockets on JDK16+ or using a native transport.

vertx-web-client/src/main/asciidoc/index.adoc

@@ -754,12 +754,12 @@ ifeval::["$lang" == "java"]
 include::override/rxjava3.adoc[]
 endif::[]
 
-== Domain sockets
+== Unix domain sockets
 
-Since 3.7.1 the Web Client supports domain sockets, e.g you can interact with the https://docs.docker.com/engine/reference/commandline/dockerd/[local Docker daemon].
+The Web Client supports Unix domain sockets.
+For example, you can interact with the https://docs.docker.com/engine/reference/commandline/dockerd/[local Docker daemon].
 
-To achieve this, the {@link io.vertx.core.Vertx} instance must be created using a native transport, you can read
-the Vert.x core documentation that explains it clearly.
+To achieve this, you must run your application with JDK16+ or create the {@link io.vertx.core.Vertx} instance using a link:../../vertx-core/java/#_native_transports[native transport].
 
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