Added a missing help file!

diff --git a/lang/en/help/courseavailability.html b/lang/en/help/courseavailability.html
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+<p align="center"><b>Course availability</b></p>
+
+<P>This option allows you to "hide" your course 
+   completely.</p>
+
+<p>It will not appear on any course listings, except to 
+   teachers of the course and administrators.</p>
+
+<p>Even if students try to access the course URL directly,
+   they will not be allowed to enter.</p>
+