Web documentation update

Issue: SPR-15149

src/docs/asciidoc/index.adoc

@@ -29,9 +29,7 @@ This reference document provides the following sections:
 
 * <<data-access.adoc#spring-data-tier,Data access and transaction management>>
 
-* The Web:
- ** <<web.adoc#spring-web,Servlet stack>>
- ** <<reactive-web.adoc#spring-webflux,Reactive stack>>
+* The Web on <<web.adoc#spring-web,Servlet>> or <<reactive-web.adoc#spring-webflux,Reactive>> stacks
 
 * <<kotlin.adoc#kotlin,Kotlin support>>
 

src/docs/asciidoc/reactive-web.adoc

 [[spring-reactive-web]]
-= Reactive Web
+= Web on Reactive Stack
 :doc-root: https://docs.spring.io
 :api-spring-framework: {doc-root}/spring-framework/docs/{spring-version}/javadoc-api/org/springframework
 :toc: left
 :toclevels: 3
 
-This part of the documentation covers support for web applications designed to run on a
-reactive web stack (Reactive Streams API + non-blocking runtime) using <<webflux-module, Spring WebFlux>>,
-including its <<webflux-fn,functional programming model>>.
+This part of the documentation covers support for reactive stack, web applications built on
+http://www.reactive-streams.org/[Reactive Streams] and adapted to non-blocking runtimes
+such as Netty, Undertow, and Servlet containers via Servlet 3.1 non-blocking I/O.
+Individual chapters cover <<webflux-module, Spring WebFlux>> and its
+<<webflux-fn,functional programming model>>. The previous section covers support for
+<<web.adoc#spring-web,Servlet web>> applications.
 
 [[spring-reactive-web-intro]]
 == Introduction

src/docs/asciidoc/web.adoc

 [[spring-web]]
-= Web
+= Web on Servlet Stack
 :doc-root: https://docs.spring.io
 :api-spring-framework: {doc-root}/spring-framework/docs/{spring-version}/javadoc-api/org/springframework
 :toc: left
 :toclevels: 2
 
-This part of the documentation covers support for web applications designed to run on a
-traditional Servlet stack (Servlet API + Servlet container).
-
-Chapters cover the Servlet-based <<mvc,Spring MVC>> web framework including <<mvc-view,Views>>,
-<<mvc-cors,CORS>>, and <<websocket,WebSocket>> support.
-
-Note that as of Spring Framework 5.0 web applications can also run on a
-<<reactive-web.adoc#spring-reactive-web, reactive web stack>> (Reactive Streams API + non-blocking runtime).
+This part of the documentation covers support for Servlet stack, web applications built on the
+Servlet API and deployed to Servlet containers. Individual chapters include <<mvc,Spring MVC>>,
+<<mvc-view,View Technologies>>, <<mvc-cors,CORS Support>>, and <<websocket,WebSocket Support>>.
+The next section covers support for <<reactive-web.adoc#spring-reactive-web,reactive web>> applications.
 
 include::web/webmvc.adoc[leveloffset=+1]