fix the history refs

src/lib/libc/crypt/crypt.3

@@ -1,4 +1,4 @@
-.\" $OpenBSD: crypt.3,v 1.18 2001/08/06 10:42:25 mpech Exp $
+.\" $OpenBSD: crypt.3,v 1.19 2002/01/24 20:33:45 mickey Exp $
 .\"
 .\" FreeSec: libcrypt
 .\"
@@ -287,7 +287,7 @@ David Burren <davidb@werj.com.au>
 A rotor-based
 .Fn crypt
 function appeared in
-.At v6 .
+.At v3 .
 The current style
 .Fn crypt
 first appeared in