[doc] Update documentation on WebAsyncManager thread pool [SPR-16397]

[spring-projects-issues]

Rossen Stoyanchev opened SPR-16397 and commented

#20751 will provide better defaults in 5.1. Until then we should have something in the documentation to at least mention that this needs to be configured when streaming with reactive types.

---

Affects: 5.0.2

Issue Links:

• Warn about use of SimpleAsyncTaskExecutor for async requests [SPR-16203] #20751 Warn about use of SimpleAsyncTaskExecutor for async requests

[spring-projects-issues]

Rossen Stoyanchev commented

Updated via 4b861a.