(Quitting): Replace inforef to emacs-xtra by conditional xref's, depending on

@iftex/@ifnottex.

diff --git a/man/trouble.texi b/man/trouble.texi
index 90e99a0ea59598a2e347f43a82a43087d6fad106..9e09dac4d4358c1357dcca92246193841ff89fe2 100644 (file)
--- a/man/trouble.texi
+++ b/man/trouble.texi
@@ -58,8 +58,14 @@ Search}).
 like @kbd{C-g}.  The reason is that it is not feasible, on MS-DOS, to
 recognize @kbd{C-g} while a command is running, between interactions
 with the user.  By contrast, it @emph{is} feasible to recognize
-@kbd{C-@key{BREAK}} at all times.  @xref{MS-DOS Keyboard,,,emacs-xtra,
-Specialized Emacs Features}.
+@kbd{C-@key{BREAK}} at all times.
+@iftex
+@xref{MS-DOS Keyboard,,,emacs-xtra, Specialized Emacs Features}.
+@end iftex
+@ifnottex
+@xref{MS-DOS Keyboard}.
+@end ifnottex
+
 
 @findex keyboard-quit
   @kbd{C-g} works by setting the variable @code{quit-flag} to @code{t}