suffixes.7: srcfix

Prepare for `MR` macro migration.

Migrate man page cross references in table rows from using font
selection escape sequences to font alternation macros to set man page
cross references.

These are a handful of cases that made a sed(1)-scripted migration
ordering-dependent with its substitution ('s') commands.

Signed-off-by: "G. Branden Robinson" <g.branden.robinson@gmail.com>
Message-ID: <20240901032548.olkeoqjwpj76h42b@illithid>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
diff --git a/man/man7/suffixes.7 b/man/man7/suffixes.7
index 657f82c..1341066 100644
--- a/man/man7/suffixes.7
+++ b/man/man7/suffixes.7
@@ -94,7 +94,11 @@
 \&.def	other definition files
 \&.desc	initial part of mail message unpacked with
 \&	\fBmunpack\fP(1)
-\&.diff	file differences (\fBdiff\fP(1) command output)
+\&.diff	T{
+file differences (\c
+.BR diff (1)
+command output)
+T}
 \&.dir	dbm data base directory file
 \&.doc	documentation file
 \&.dsc	Debian Source Control (source package)
@@ -109,7 +113,10 @@
 \&.f90	Fortran 90 source
 \&.fas	precompiled Common-Lisp
 \&.fi	Fortran include files
-\&.fig	FIG image file (used by \fBxfig\fP(1))
+\&.fig	T{
+FIG image file (used by
+.BR xfig (1))
+T}
 \&.fmt	TeX format file
 \&.gif	Compuserve Graphics Image File format
 \&.gmo	GNU format message catalog
@@ -250,7 +257,12 @@
 \&.xs	Perl xsub file produced by h2xs
 \&.xsl	XSL stylesheet
 \&.y	\fByacc\fP(1) or \fBbison\fP(1) (parser generator) files
-\&.z	File compressed using \fBpack\fP(1) (or an old \fBgzip\fP(1))
+\&.z	T{
+File compressed using
+.BR pack (1)
+(or an old
+.BR gzip (1))
+T}
 \&.zip	\fBzip\fP(1) archive
 \&.zoo	\fBzoo\fP(1) archive
 \&\[ti]	Emacs or \fBpatch\fP(1) backup file