Fix redirect for Spring HATEOAS - #30107

Thanks for the PR @Buzzardo but there is no such anchor.

The current value also does not exist anywhere in the docs. It seems that the point of this value is to get the Initializr to the right place in the docs. Given that https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#web.spring-hateoas is a valid target and that https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#spring-mvc.spring-hateoas is not a valid target, I figured my change would fix the issue. NOTE: spring-mvc.spring-hateoas is not in the doc files, but web.spring-hateoas is in the doc files.

While I'm here, what is the point of these values? None of them exist in the document, so there is other processing going on, but there is no indication of what that other processing is.

It rewrites old anchors to the new one, see be85f31