Spring Update javadoc and reference docs for consistent version and package references to the Jakarta EE 9 APIs

The javadoc for WebApplicationInitializer and SpringServletContainerInitializer references Servlet 3.0 in a few places. It should be Servlet 5 now.

Comment From: jhoeller

Along with #27690 and #27692, I'm also updating other EE doc references for Jakarta EE 9 package names (extending the scope of this issue).