Update docs on HTTP/2

Author: rstoyanchev

src/docs/asciidoc/web/webflux.adoc

@@ -1446,3 +1446,19 @@ For advanced mode, remove `@EnableWebFlux` and extend directly from
 You can keep existing methods in `WebConfig` but you can now also override bean declarations
 from the base class and you can still have any number of other ``WebMvcConfigurer``'s on
 the classpath.
+
+
+
+
+[[webflux-http2]]
+== HTTP/2
+[.small]#<<web.adoc#mvc-http2,Same in Spring MVC>>#
+
+Servlet 4 containers are required to support HTTP/2 and Spring Framework 5 is compatible
+with Servlet API 4. From a programming model perspective there is nothing specific that
+applications need to do. However there are considerations related to server configuration.
+For more details please check out the
+https://github.com/spring-projects/spring-framework/wiki/HTTP-2-support[HTTP/2 wiki page].
+
+Currently Spring WebFlux does not support HTTP/2 with Netty. There is also no support for
+pushing resources programmatically to the client.

src/docs/asciidoc/web/webmvc.adoc

@@ -20,7 +20,9 @@ https://github.com/spring-projects/spring-framework/tree/master/spring-webflux[s
 This section covers Spring Web MVC. The <<web-reactive.adoc#spring-web-reactive,next section>>
 covers Spring WebFlux.
 
-
+For baseline information and compatibility with Servlet container and Java EE version
+ranges please visit the Spring Framework
+https://github.com/spring-projects/spring-framework/wiki/Spring-Framework-Versions[Wiki].
 
 
 [[mvc-servlet]]
@@ -1555,6 +1557,8 @@ requests are allowed to access a session concurrently.
 
 |`javax.servlet.http.PushBuilder`
 |Servlet 4.0 push builder API for programmatic HTTP/2 resource pushes.
+ Note that per Servlet spec, the injected `PushBuilder` instance can be null if the client
+ does not support that HTTP/2 feature.
 
 |`java.security.Principal`
 |Currently authenticated user; possibly a specific `Principal` implementation class if known.
@@ -4808,23 +4812,15 @@ include::webmvc-view.adoc[leveloffset=+1]
 
 
 [[mvc-http2]]
-== HTTP/2 support
-
-
-[[mvc-http2-servlet4]]
-=== Servlet 4 support
-
-Spring MVC supports the Servlet 4 API; of course, the chosen Servlet container must support
-that API in the first place.
-
-It is now possible to inject a `javax.servlet.http.PushBuilder`
-as a Controller method argument for pushing HTTP/2 resources programmatically.
-Note that per Servlet spec, the injected `PushBuilder` instance can be null if the client
-does not support that HTTP/2 feature. See <<mvc-ann-arguments>>.
-
-[[mvc-http2-container]]
-=== Container configuration
-
-For more information on how to configure your Servlet container for HTTP/2, please check
-out the https://github.com/spring-projects/spring-framework/wiki/HTTP-2-support[dedicated
-wiki page on HTTP/2 support].
+== HTTP/2
+[.small]#<<web-reactive.adoc#webflux-http2,Same in Spring WebFlux>>#
+
+Servlet 4 containers are required to support HTTP/2 and Spring Framework 5 is compatible
+with Servlet API 4. From a programming model perspective there is nothing specific that
+applications need to do. However there are considerations related to server configuration.
+For more details please check out the
+https://github.com/spring-projects/spring-framework/wiki/HTTP-2-support[HTTP/2 wiki page].
+
+The Servlet API does expose one construct related to HTTP/2. The
+`javax.servlet.http.PushBuilder` can used to proactively push resources to clients and it
+is supported as a <<mvc-ann-arguments,method argument>> to `@RequestMapping` methods.