update siphash manpages to reflect change in return type spelling.

ok dlg

src/lib/libc/hash/SipHash24.3

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: SipHash24.3,v 1.3 2014/12/08 20:52:25 tedu Exp $
+.\"	$OpenBSD: SipHash24.3,v 1.4 2015/02/21 02:43:07 tedu Exp $
 .\"
 .\" Copyright (c) 2014 David Gwynne <dlg@openbsd.org>
 .\"
@@ -14,7 +14,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: December 8 2014 $
+.Dd $Mdocdate: February 21 2015 $
 .Dt SIPHASH24 3
 .Os
 .Sh NAME
@@ -30,11 +30,11 @@
 .Fn "SipHash24_Init" "SIPHASH_CTX *ctx" "const SIPHASH_KEY *key"
 .Ft void
 .Fn "SipHash24_Update" "SIPHASH_CTX *ctx" "const void *data" "size_t len"
-.Ft u_int64_t
+.Ft uint64_t
 .Fn "SipHash24_End" "SIPHASH_CTX *ctx"
 .Ft void
 .Fn "SipHash24_Final" "void *digest" "SIPHASH_CTX *ctx"
-.Ft u_int64_t
+.Ft uint64_t
 .Fn "SipHash24" "const SIPHASH_KEY *key" "const void *data" "size_t len"
 .Sh DESCRIPTION
 The SipHash algorithm is a keyed hash algorithm optimised for short