Add some HISTORY sections to manpages

environ(7) was in AT&T Version 7
ac(8): Add a HISTORY section
sa(8): Add a HISTORY section
sqrt(3): Add the actual sqrt function to the HISTORY section

Obtained from: OpenBSD

Submitted by:	gbergling@gmail.com
Approved by:	bcr@(mentor)
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D23693

lib/msun/man/sqrt.3

@@ -28,7 +28,7 @@
 .\"     from: @(#)sqrt.3	6.4 (Berkeley) 5/6/91
 .\" $FreeBSD$
 .\"
-.Dd March 5, 2011
+.Dd February 15, 2020
 .Dt SQRT 3
 .Os
 .Sh NAME
@@ -113,6 +113,9 @@ The
 function appeared in
 .Bx 4.3 .
 The
+.Fn sqrt
+function appeared in
+.At v2 .
 .Fn sqrtl
 function appeared in
 .Fx 8.0 .

share/man/man7/environ.7

@@ -28,7 +28,7 @@
 .\"	@(#)environ.7	8.3 (Berkeley) 4/19/94
 .\" $FreeBSD$
 .\"
-.Dd April 12, 2003
+.Dd February 14, 2020
 .Dt ENVIRON 7
 .Os
 .Sh NAME
@@ -261,4 +261,4 @@ built-in command in
 The
 .Nm
 manual page appeared in
-.Bx 4.2 .
+.At v7 .

usr.sbin/ac/ac.8

@@ -25,7 +25,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd January 21, 2010
+.Dd February 14, 2020
 .Dt AC 8
 .Os
 .Sh NAME
@@ -126,6 +126,16 @@ ac -p -t "!ttyd*" > other
 .Xr getutxent 3 ,
 .Xr init 8 ,
 .Xr sa 8
+.Sh HISTORY
+An
+.Nm
+command appeared in
+.At v5 .
+This version of
+.Nm
+was written for
+.Nx 0.9a
+from the specification provided by various systems' manual pages.
 .\" .Sh NOTES
 .\" If COMPAT_SUNOS is defined
 .\" .Nm ac

usr.sbin/sa/sa.8

@@ -29,7 +29,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd May 18, 2007
+.Dd February 14, 2020
 .Dt SA 8
 .Os
 .Sh NAME
@@ -234,6 +234,14 @@ per-user accounting summary database
 .Xr acct 5 ,
 .Xr ac 8 ,
 .Xr accton 8
+.Sh HISTORY
+.Nm
+first appeared in
+.At v5 .
+.Nm
+was rewritten for
+.Nx 0.9a
+from the specification provided by various systems' manual pages.
 .Sh AUTHORS
 .An Chris G. Demetriou Aq Mt cgd@postgres.berkeley.edu
 .Sh CAVEATS