Fixed a couple of site admin helpfiles spotted by Gregor Anzelj.

(cherry picked from commit 68992e28)

htdocs/lang/en.utf8/help/forms/siteoptions.allowpublicprofiles.html

+<h3>Allow public profiles</h3>
+<p>If you wish to allow users to make their profile page accessible to the public, this option should be set to 'yes'. Even if public, only logged in users can use interactive features such as the wall.</p>