mdo.1: Describe this command's history

Reviewed by: imp, ziaee
Pull Request: https://github.com/freebsd/freebsd-src/pull/1712

usr.bin/mdo/mdo.1

@@ -3,7 +3,7 @@
 .\"
 .\" SPDX-License-Identifier: BSD-2-Clause
 .\"
-.Dd May 22, 2024
+.Dd May 26, 2025
 .Dt MDO 1
 .Os
 .Sh NAME
@@ -42,3 +42,8 @@ and keep the group from the calling user.
 .Sh SEE ALSO
 .Xr su 1 ,
 .Xr mac_do 4
+.Sh HISTORY
+The
+.Nm
+command appeared in
+.Fx 14.2 .