Changed wiki help to clarify that the wiki markup only works when not…

… using the WYSIWYG editor. (This was seriously confusing our users!)

lang/en_utf8/help/wiki/howtowiki.html

@@ -58,8 +58,10 @@ <h2>How To Wiki</h2>
 
 <p><a name="wikimarkup"></a><b>Wiki Markup</b>:<br />
 
-Each page inside a Wiki can be edited easily, using wiki markup.
-
+If you are using the WYSIWYG HTML editor with ordinary word-processor style controls, then you 
+should use those controls to format your entry. Otherwise (when the edit box is just a normal 
+text box with no special controls) you can use the following wiki markup. 
+<b>These features do not apply when using the WYSIWYG editor</b>.   
 </p>
 
 <h4> Paragraphs</h4>