About the link to wiki in reversible.html

[Joel Brobecker]

> Please do not worry about it.  Link is changed to
> http://sourceware.org/gdb/wiki/ReverseDebug  :)

We certainly made it more effort for us by writing a new page instead of
updating the one we had. Let's update rather than re-recreate, next time.

In the meantime, I checked in the WWW change, and also updated the old
wiki page to say:

    This page is now obsolete and has been replaced by ReverseDebug.
    Please help us fix all links to this page by sending an email to gdb
    [AT] sourceware DOT org (thank you). 

-- 
Joel