WebClient content included in WebFlux section only

Before this commit WebClient documentation was also included from the
Integration section where the RestTemplate is documented. That is
convenient but results in duplicate content under different URLs.

This commit removes the include from the Integration section and leaves

src/docs/asciidoc/integration.adoc

@@ -953,9 +953,9 @@ The Spring Framework offers two choices for client-side access to REST endpoints
 * <<rest-resttemplate>> -- the original Spring REST client with an API similar to other
 template classes in Spring, such as `JdbcTemplate`, `JmsTemplate` and others. The
 `RestTemplate` is built for synchronous use with the blocking I/O.
-* <<webflux-client,WebClient>> -- reactive client with a functional,
-fluent API. It is built on a non-blocking foundation for async and sync scenarios and
-supports Reactive Streams back pressure.
+* <<web-reactive.adoc#webflux-client,WebClient>> -- reactive client with a functional,
+fluent API from the `spring-webflux` module. It is built on a non-blocking foundation
+for async and sync scenarios and supports Reactive Streams back pressure.
 
 
 [[rest-resttemplate]]
@@ -1348,10 +1348,6 @@ Please use the <<web-reactive.adoc#webflux-client,WebClient>> instead.
 
 
 
-include::web/webflux-webclient.adoc[leveloffset=+3]
-
-
-
 [[ejb]]
 == Enterprise JavaBeans (EJB) integration