Update note to mention SSH agent forwarding

Part 1, for initial updates to QSs for the installation media
Will include a link when I add more info to the Admin Guide

jsc#PED-7399

xml/article_installation.xml

@@ -397,9 +397,12 @@ softdog           16384  1</screen>
       them if they do not already exist.
      </para>
      <para>
-      If you intend to set up the first node as a user with <command>sudo</command> privileges,
-      you must ensure the user's SSH keys exist (or will be generated) locally on the node,
-      not on a remote system.
+      In most cases, the &rootuser; or <command>sudo</command> user's SSH keys must exist
+      (or be generated) locally on the node.
+     </para>
+     <para>
+      Alternatively, a <command>sudo</command> user's SSH keys can exist on a remote server
+      and be passed to the node via SSH agent forwarding. This requires additional configuration.
      </para>
     </important>
    </step>