Add manual pages for the newly added setres[ug]id system calls.

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diff --git a/lib/libc/sys/setresuid.2 b/lib/libc/sys/setresuid.2
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+.\" Copyright (c) 2000
+.\"      Sheldon Hearn.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES
+.\"
+.\" $FreeBSD$
+.\"
+.Dd January 17, 2000
+.Dt SETRESUID 2
+.Os
+.Sh NAME
+.Nm setresgid ,
+.Nm setresuid
+.Nd set real, effective and saved user or group ID
+.Sh SYNOPSIS
+.Fd #include <sys/types.h>
+.Fd #include <unistd.h>
+.Ft int
+.Fn setresgid "gid_t rgid" "gid_t egid" "gid_t sgid"
+.Ft int
+.Fn setresuid "uid_t ruid" "uid_t euid" "uid_t suid"
+.Sh DESCRIPTION
+The
+.Nm setresuid
+system call sets the real,
+effective and saved user IDs of the current process.
+The analogous
+.Nm setresgid
+sets the real, effective and saved group IDs.
+.Pp
+Privileged processes may set these IDs
+to arbitrary values.
+Unprivileged processes are restricted
+in that each of the new IDs must match one of the current IDs.
+.Pp
+Passing -1 as an argument causes the corresponding value
+to remain unchanged.
+.Sh RETURN VALUES
+These functions return the value 0 if successful;
+otherwise the value -1 is returned
+and the global variable
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+.Bl -tag -width indent
+.It Er EPERM
+The calling process was not privileged
+and tried to change one or more IDs to a value
+which was not the current real ID, the current effective ID
+nor the current saved ID.
+.Sh SEE ALSO
+.Xr getegid 2 ,
+.Xr geteuid 2 ,
+.Xr getgid 2 ,
+.Xr getuid 2 ,
+.Xr isssetugid 2 ,
+.Xr setgid 2 ,
+.Xr setregid 2 ,
+.Xr setreuid 2 ,
+.Xr setuid 2 ,
+.Sh STANDARDS
+These system calls are not available on many platforms.
+They exist in
+.Fx
+to support Linux binaries linked against GNU libc2.