sed(1): Add a reference for a 4.4BSD manual document

Obtained from:	OpenBSD

(cherry picked from commit 9048d9a933)

share/man/man9/mbuf.9

@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd January 28, 2021
+.Dd April 8, 2021
 .Dt MBUF 9
 .Os
 .\"
@@ -1216,6 +1216,15 @@ See above.
 .Sh SEE ALSO
 .Xr ifnet 9 ,
 .Xr mbuf_tags 9
+.Rs
+.\" 4.4BSD SMM:18
+.%A S. J. Leffler
+.%A W. N. Joy
+.%A R. S. Fabry
+.%A M. J. Karels
+.%T Networking Implementation Notes
+.%B 4.4BSD System Manager's Manual (SMM)
+.Re
 .Sh HISTORY
 .\" Please correct me if I'm wrong
 .Vt Mbufs

usr.bin/sed/sed.1

@@ -31,7 +31,7 @@
 .\"	@(#)sed.1	8.2 (Berkeley) 12/30/93
 .\" $FreeBSD$
 .\"
-.Dd June 10, 2020
+.Dd April 8, 2021
 .Dt SED 1
 .Os
 .Sh NAME
@@ -629,6 +629,15 @@ sed -i '' -e 's/foo/bar/g' test.txt
 .Xr grep 1 ,
 .Xr regex 3 ,
 .Xr re_format 7
+.Rs
+.\" 4.4BSD USD:15
+.%A Lee E. McMahon
+.%I AT&T Bell Laboratories
+.%T SED \(em A Non-interactive Text Editor
+.%R Computing Science Technical Report
+.%N 77
+.%D January 1979
+.Re
 .Sh STANDARDS
 The
 .Nm