Improve WebFlux.fn Java configuration documentation [SPR-16360]

[spring-projects-issues]

Stéphane Nicoll opened SPR-16360 and commented

See spring-projects/spring-boot#11576

Looking at the current reference guide, there is a very good explanation at how a router can be composed from multiple RouterFunction. There is also a link to the Java configuration part but this section doesn't seem to have anything specific to WebFlux.fn

It would be nice if that part of the doc had a section so that we understand what @EnableWebFlux does in that situation.

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Affects: 5.0.2

Referenced from: commits 72e3c43, cdf2ab9

[spring-projects-issues]

Rossen Stoyanchev commented

Note I've also done an update to the Javadoc for @EnableWebFlux and WebFluxConfigurer to make it more clear which configuration options apply to annotated controllers vs functional endpoints.