now maintained in a separate "mysqldoc" BK source tree) - it will be
   replaced with the correct manual.texi when building the official
   source distribution
 - fixed automake error about reservedwords.texi by moving it to EXTRA_DIST
   instead


Docs/Makefile.am:
   - moved reservedwords.texi from info_TEXINFOS to EXTRA_DIST since it is
     not a full-featured texi file and automake would complain about
     "missing @setfilename"
Docs/manual.texi:
   - replaced manual.texi with a dummy placeholder file (manual.texi is
     now maintained in a separate "mysqldoc" BK source tree) - it will be
     replaced with the correct manual.texi when building the official
     source distribution