URL Template doc mentions non-existent @RouteAlias doc

[dmitrilc]

The doc at https://vaadin.com/docs/latest/flow/routing/templates/#defining-route-templates-using-route-routealias-and-routeprefix
mentions that there are documentation for the annotations @Route, @RouteAlias and @RoutePrefix at https://vaadin.com/docs/latest/flow/routing/layout.

But the Router Layouts and Nested Router Targets documentation only includes docs for @Route and @RoutePrefix, and not @RouteAlias at all.