sigpause.3: Make the Xr bold

[Josiah Frentsos]

Index: sigpause.3
===================================================================
RCS file: /cvs/src/lib/libc/compat-43/sigpause.3,v
retrieving revision 1.14
diff -u -p -r1.14 sigpause.3
--- sigpause.3  17 Jul 2013 05:42:10 -0000      1.14
+++ sigpause.3  12 Dec 2022 23:13:44 -0000
@@ -38,8 +38,10 @@
 .Ft int
 .Fn sigpause "int sigmask"
 .Sh DESCRIPTION
-.Sy This interface is made obsolete by
+.Bf -symbolic
+This interface is made obsolete by
 .Xr sigsuspend 2 .
+.Ef
 .Pp
 .Fn sigpause
 assigns