Restructure Web Section of the documentation to include reactive support [SPR-15149]

[spring-projects-issues]

Rossen Stoyanchev opened SPR-15149 and commented

The current chapter on reactive support is a temporary solution for the milestone phase. We need to take the steps to restructure the Web section so that it includes Servlet and Reactive stack based content side by side.

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Affects: 5.0 M4

Sub-tasks:

• Please add documentation and examples on reactive WebSockets [SPR-15700] #18762 Please add documentation and examples on reactive WebSockets
• Docs for WebTestClient are pretty thin [SPR-16009] #20558 Docs for WebTestClient are pretty thin

Issue Links:

• Improve webclient and webflux documentation [SPR-15360] #19923 Improve webclient and webflux documentation
• Documentation for WebFlux fn [SPR-15362] #19925 Documentation for WebFlux fn