[Bug ada/65104] gnat_rm.texi 'next/prev in menu and sectioning difffer' warnings

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65104

--- Comment #1 from vries at gcc dot gnu.org ---
Created attachment 34800
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34800&action=edit
tentative patch