* man/chmod.x: Don't rely on the bold markup for 'a' to
distinguish it as that's not done in all cases.
to the file will be changed: the user who owns it (\fBu\fP), other
users in the file's group (\fBg\fP), other users not in the file's
group (\fBo\fP), or all users (\fBa\fP). If none of these are given,
-the effect is as if \fBa\fP were
+the effect is as if (\fBa\fP) were
given, but bits that are set in the umask are not affected.
.PP
The operator \fB+\fP causes the selected file mode bits to be added to