Add Chromium configuration note to ssbrowser

- As Chromium and Chrome share most of the same code base but are
  configured in different locations, add a note showing the different
  configuration locations.

A part of https://fedorahosted.org/freeipa/ticket/823

Reviewed-By: Martin Basti <mbasti@redhat.com>
Reviewed-By: Petr Vobornik <pvoborni@redhat.com>

install/html/ssbrowser.html

@@ -134,6 +134,11 @@
                 </code></div>
             </li>
         </ol>
+        <ol>
+            <p>
+                <strong>Note:</strong> If using Chromium, use <code>/etc/chromium/policies/managed/</code> instead of <code>/etc/opt/chrome/policies/managed/</code> for the two SPNEGO Chrome configuration steps above.
+            </p>
+        </ol>
 
         <h2>Internet Explorer</h2>
         <p>