In nroff, \n is a macro that "Interpolates number register x" (where x
is the character following the \n sequence), thus the man page currently
prints 0 instead of \n" in several lines, leading to output such as:
printf("The _NET_WM_NAME atom has ID %u0, reply->atom);
It needs to be escaped here, as \\n, as is done in other examples in
this man page already.
Reported-by: Stefan Merettig
Signed-off-by: Alan Coopersmith <firstname.lastname@example.org>