man: document systemd-update-generator

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+<?xml version="1.0"?>
+<!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!--
+  This file is part of systemd.
+
+  Copyright 2012 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+<refentry id="systemd-system-update-generator">
+
+        <refentryinfo>
+                <title>systemd-system-update-generator</title>
+                <productname>systemd</productname>
+
+                <authorgroup>
+                        <author>
+                                <contrib>Developer</contrib>
+                                <firstname>Lennart</firstname>
+                                <surname>Poettering</surname>
+                                <email>lennart@poettering.net</email>
+                        </author>
+                </authorgroup>
+        </refentryinfo>
+
+        <refmeta>
+                <refentrytitle>systemd-system-update-generator</refentrytitle>
+                <manvolnum>8</manvolnum>
+        </refmeta>
+
+        <refnamediv>
+                <refname>systemd-system-update-generator</refname>
+                <refpurpose>Generator for redirecting boot to offline update mode</refpurpose>
+        </refnamediv>
+
+        <refsynopsisdiv>
+                <para><filename>/usr/lib/systemd/system-generators/systemd-system-update-generator</filename></para>
+        </refsynopsisdiv>
+
+        <refsect1>
+                <title>Description</title>
+
+                <para><filename>systemd-system-update-generator</filename>
+                is a generator that automatically redirects the boot
+                process to <filename>system-update.target</filename>
+                if <filename>/system-update</filename> exists. This is
+                required to implement the logic explained in the
+                <ulink
+                url="http://freedesktop.org/wiki/Software/systemd/SystemUpdates">System
+                Updates Specification</ulink>.
+                </para>
+
+                <para><filename>systemd-system-update-generator</filename>
+                implements the <ulink
+                url="http://www.freedesktop.org/wiki/Software/systemd/Generator">generator
+                specification</ulink>.</para>
+        </refsect1>
+
+        <refsect1>
+                <title>See Also</title>
+                <para>
+                        <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+                        <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>
+                </para>
+        </refsect1>
+
+</refentry>