Mention when -d, -p and -r first hit FreeBSD.

Bump the document date to when the change was made (rather than when the PR
was submitted).

Suggested by:	pluknet

usr.bin/script/script.1

@@ -28,7 +28,7 @@
 .\"	@(#)script.1	8.1 (Berkeley) 6/6/93
 .\" $FreeBSD$
 .\"
-.Dd September 28, 2011
+.Dd July 30, 2012
 .Dt SCRIPT 1
 .Os
 .Sh NAME
@@ -168,7 +168,9 @@ The
 and
 .Fl r
 options first appeared in
-.Nx 2.0 .
+.Nx 2.0
+and were ported to
+.Fx 10 .
 .Sh BUGS
 The
 .Nm