Problems with ln.1:

Parenthesized comments in command synopsis.  This is impossible
to translate to DocBook.

--- ln.1-unpatched	2018-04-17 21:19:33.699561983 -0400
+++ ln.1	2018-04-17 21:20:35.227440696 -0400
@@ -4,16 +4,16 @@
 ln \- make links between files
 .SH SYNOPSIS
 .B ln
-[\fI\,OPTION\/\fR]... [\fI\,-T\/\fR] \fI\,TARGET LINK_NAME   (1st form)\/\fR
+[\fI\,OPTION\/\fR]... [\fI\,-T\/\fR] \fI\,TARGET LINK_NAME\/\fR
 .br
 .B ln
-[\fI\,OPTION\/\fR]... \fI\,TARGET                  (2nd form)\/\fR
+[\fI\,OPTION\/\fR]... \fI\,TARGET\/\fR
 .br
 .B ln
-[\fI\,OPTION\/\fR]... \fI\,TARGET\/\fR... \fI\,DIRECTORY     (3rd form)\/\fR
+[\fI\,OPTION\/\fR]... \fI\,TARGET\/\fR... \fI\,DIRECTORY\/\fR
 .br
 .B ln
-[\fI\,OPTION\/\fR]... \fI\,-t DIRECTORY TARGET\/\fR...  \fI\,(4th form)\/\fR
+[\fI\,OPTION\/\fR]... \fI\,-t DIRECTORY TARGET\/\fR...
 .SH DESCRIPTION
 .\" Add any additional description here
 .PP