/usr/share/help/C/system-admin-guide/login-logo.page is in gnome-user-guide 3.8.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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xmlns:its="http://www.w3.org/2005/11/its"
type="topic" style="task"
id="login-logo">
<info>
<link type="guide" xref="index" group="login" />
<revision version="0.1" date="2012-05-21" status="draft"/>
<revision pkgversion="3.8" version="0.1" date="2013-04-24" status="review"/>
<credit type="author copyright">
<name>Matthias Clasen</name>
<email its:translate="no">matthias.clasen@gmail.com</email>
<years>2012</years>
</credit>
<credit type="author copyright">
<name>Michael Hill</name>
<email its:translate="no">mdhillca@gmail.com</email>
<years>2012</years>
</credit>
<credit type="author copyright editor">
<name>Ekaterina Gerasimova</name>
<email its:translate="no">kittykat3756@gmail.com</email>
<years>2013</years>
</credit>
<desc>Edit a <sys its:translate="no">GDM</sys> <sys its:translate="no">dconf</sys> profile to display an image on the login screen.</desc>
</info>
<title>Add a greeter logo to the login screen</title>
<comment>
<cite date="2012-11-07" href="mailto:mdhillca@gmail.com">Michael Hill</cite>
<p>Adapted from l-g-o SysAdminGuide page.</p>
</comment>
<p>The logo on the login screen is controlled by the
<cmd>org.gnome.login-screen.logo</cmd>
<sys its:translate="no">GSettings</sys> key.
<sys its:translate="no">GDM</sys> uses its own
<sys its:translate="no">dconf</sys> profile. To change settings in this
profile, add a key file to the
<file its:translate="no">/etc/dconf/db/gdm.d</file> directory and run
<cmd its:translate="no">dconf update</cmd>.</p>
<listing>
<title>Sample <file its:translate="no">/etc/dconf/db/gdm.d/01-logo</file>
file</title>
<code its:translate="no">[org/gnome/login-screen]
logo='<input>/usr/share/pixmaps/logo/greeter-logo.png</input>'
</code>
</listing>
<note>
<p><sys its:translate="no">dconf</sys> key files are slightly different
from <sys its:translate="no">GSettings</sys> override files.</p>
</note>
<!--
<section id="prob-update">
<title>What if the logo does not update?</title>
TODO
</section>
-->
</page>
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