config(8): Mention the authors of a paper in the SEE ALSO section

Obtained from:	OpenBSD
MFC after:	1 week

usr.sbin/config/config.8

@@ -28,7 +28,7 @@
 .\"     @(#)config.8	8.2 (Berkeley) 4/19/94
 .\" $FreeBSD$
 .\"
-.Dd June 29, 2020
+.Dd April 9, 2021
 .Dt CONFIG 8
 .Os
 .Sh NAME
@@ -249,7 +249,11 @@ The
 .Sx SYNOPSIS
 portion of each device in section 4.
 .Rs
+.\" 4.4BSD SMM:2
+.%A S. J. Leffler
+.%A M. J. Karels
 .%T "Building 4.3 BSD UNIX System with Config"
+.%B 4.4BSD System Manager's Manual (SMM)
 .Re
 .Sh HISTORY
 The