more libc, less kernel documentation

src/lib/libc/hash/SipHash24.3

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: SipHash24.3,v 1.2 2014/12/08 20:49:23 tedu Exp $
+.\"	$OpenBSD: SipHash24.3,v 1.3 2014/12/08 20:52:25 tedu Exp $
 .\"
 .\" Copyright (c) 2014 David Gwynne <dlg@openbsd.org>
 .\"
@@ -91,14 +91,6 @@ It is recommended that the
 .Vt SIPHASH_KEY
 key be generated with
 .Xr arc4random_buf 3 .
-.Sh CONTEXT
-.Fn SipHash24_Init ,
-.Fn SipHash24_Update ,
-.Fn SipHash24_End ,
-.Fn SipHash24_Final
-and
-.Fn SipHash24
-can be called during autoconf, from process context, or from interrupt context.
 .Sh RETURN VALUES
 .Fn SipHash24_End
 and
@@ -106,3 +98,6 @@ and
 return the 64-bit message digest in the host's native endian representation.
 .Sh SEE ALSO
 .Xr arc4random_buf 3
+.Sh HISTORY
+These functions appeared in
+.Ox 5.7 .