use $2b in the bcrypt example, ok tedu

src/lib/libc/crypt/crypt.3

@@ -1,4 +1,4 @@
-.\" $OpenBSD: crypt.3,v 1.35 2014/05/12 19:13:14 tedu Exp $
+.\" $OpenBSD: crypt.3,v 1.36 2014/05/16 14:12:19 sthen Exp $
 .\"
 .\" FreeSec: libcrypt
 .\"
@@ -31,7 +31,7 @@
 .\"
 .\" Manual page, using -mandoc macros
 .\"
-.Dd $Mdocdate: May 12 2014 $
+.Dd $Mdocdate: May 16 2014 $
 .Dt CRYPT 3
 .Os
 .Sh NAME
@@ -140,7 +140,7 @@ An encoded
 would specify 256 rounds.
 A valid Blowfish password looks like this:
 .Pp
-.Dq $2a$12$eIAq8PR8sIUnJ1HaohxX2O9x9Qlm2vK97LJ5dsXdmB.eXF42qjchC .
+.Dq $2b$12$FPWWO2RJ3CK4FINTw0Hi8OiPKJcX653gzSS.jqltHFMxyDmmQ0Hqq .
 .Pp
 The whole Blowfish password string is passed as
 .Fa setting