manual.texi Update pubdate for PHP/MySQL book.

@item Available @tab            @uref{http://service.bfast.com/bfast/click?bfmid=2181&sourceid=34233559&bfpid=0672317842&bfmtype=book, Barnes and Noble}

@item Publisher @tab            Sams

@item Authors   @tab            Luke Welling, Laura Thomson

@item Pub Date  @tab            November 2000

@item Pub Date  @tab            March 2001

@item ISBN      @tab            0672317842

@item Pages     @tab            700

@item Price     @tab            $49.99