4201 fopen(3c): The w mode should be bold, not underlined

@@ -129,17 +129,17 @@
 When opened, a stream is fully buffered if and only if it can be determined not
 to refer to an interactive device. The error and end-of-file indicators for the
 stream are cleared.
 .sp
 .LP
-If \fImode\fR begins with \fIw\fR or \fBa\fR and the file did not previously
+If \fImode\fR begins with \fBw\fR or \fBa\fR and the file did not previously
 exist, upon successful completion, \fBfopen()\fR function will mark for update
 the \fBst_atime\fR, \fBst_ctime\fR and \fBst_mtime\fR fields of the file and
 the \fBst_ctime\fR and \fBst_mtime\fR fields of the parent directory.
 .sp
 .LP
-If \fImode\fR begins with \fIw\fR and the file did previously exist, upon
+If \fImode\fR begins with \fBw\fR and the file did previously exist, upon
 successful completion, \fBfopen()\fR will mark for update the \fBst_ctime\fR
 and \fBst_mtime\fR fields of the file.  The \fBfopen()\fR function will
 allocate a file descriptor as \fBopen\fR(2) does.
 .sp
 .LP