[BUG] "\fC" macro in ox-man.el [9.6.15 (release_9.6.15 @ /usr/share/emacs/29.2/lisp/org/)]

[Xiyue Deng]

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(This was first reported to Emacs at
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=69483)

"mu4e"[1] (a popular Emacs mail client) uses Org to generate its
manpages.  However, the generated output contains macros that are not
understood by groff.  After some debugging, Jeremy traced this back to
the macro "\fC" used in ox-man.el[2].  Git history shows that this may
have been there since the beginning.  We tried to find a documentation
for the "\fC" macro but has not been able to find one.  Jeremy suggests
that "C" may be an old alias for Courier, and if that's the case it
should be changed to "\f[CR]".  Would be great if Org people can
confirm.

Emacs  : GNU Emacs 29.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.38, 
cairo version 1.16.0)
 of 2024-01-20, modified by Debian
Package: Org mode version 9.6.15 (release_9.6.15 @ 
/usr/share/emacs/29.2/lisp/org/)