doco suggestion

Hi Spring team,

I couldn't find any docs for the preferred handling of expired sessions 
within the annotated controllers - specifically, the equivalent of 
AbstractFormController.handleInvalidSubmit. This worked for me and could 
be added:

@ExceptionHandler(HttpSessionRequiredException.class)
public String handleSessionExpiredException(HttpSessionRequiredException ex,
         HttpServletRequest request) {
     return "redirect:/index.htm?sessionTimeout";
}

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