First cut of the sctp man pages. Still need work.

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diff --git a/lib/libc/net/sctp_getaddrlen.3 b/lib/libc/net/sctp_getaddrlen.3
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+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
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+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
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+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
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+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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+.\"     From: @(#)send.2	8.2 (Berkeley) 2/21/94
+.\" $FreeBSD$
+.\"
+.Dd December 15, 2006
+.Dt SCTP_GETADDRLEN 3
+.Os
+.Sh NAME
+.Nm sctp_getaddrlen
+.Nd return the address length of an address family
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.In sys/sctp.h
+.Ft int
+.Fn sctp_getaddrlen "sa_family_t family""
+.Sh DESCRIPTION
+The
+.Fn sctp_getaddrlen
+returns the size of a specific address family. This function
+is provided for application binary compatability since it
+provides the application with the size the operating system
+thinks the specific address family is. Note that the function
+will actually create an SCTP socket and then gather the
+information via a
+.Fn getsockopt
+system calls. If for some reason a SCTP socket cannot
+be created or the getsockopt fails, an error will be returned 
+with errno set as specified in the
+.Fn socket
+or
+.Fn getsockopt
+system call.
+.Sh RETURN VALUES
+The call returns the number of bytes that the operating
+system expects for the specific address family or -1.
+.Sh ERRORS
+The
+.Fn sctp_getaddrlen
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The address family specified does NOT exist.
+.El
+.Sh SEE ALSO
+.Xr sctp 4 ,
+.Xr socket 2 ,
+.Xr getsockopt 2 ,
+