The intermediate steps are not useful.  For example, after the first sed
script, we have changes like this:

diff --git a/man2/syscalls.2 b/man2/syscalls.2
index 7a7d6d730..979dba538 100644
--- a/man2/syscalls.2
+++ b/man2/syscalls.2

@@ -187,7 +187,8 @@ .SS System call list
 \fBchdir\fP(2)	1.0
 \fBchmod\fP(2)	1.0
 \fBchown\fP(2)	2.2	T{
-See \fBchown\fP(2) for
+See .BR chown (2)
+for
 version details
 T}
 \fBchown32\fP(2)	2.4

Having ".BR chown (2)" sitting out there as unformatted text (because
macro calls have to _start_ an input line) is obviously not useful.

However, I did discover that the second script was a no-op!  So I'm
dropping that (actually, replacing it) and will submit a v2.