Typo in wiki link example (#2673).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2362 e93f8b46-1217-0410-a6f0-8f06a7374b81

public/help/wiki_syntax_detailed.html

@@ -61,7 +61,7 @@
 
         <ul>
             <li><strong>[[sandbox:some page]]</strong> displays a link to the page named 'Some page' of the Sandbox wiki</li>
-            <li><strong>[[sandbox]]</strong> displays a link to the Sandbox wiki main page</li>
+            <li><strong>[[sandbox:]]</strong> displays a link to the Sandbox wiki main page</li>
         </ul>
 
         <p>Wiki links are displayed in red if the page doesn't exist yet, eg: <a href="Nonexistent_page.html" class="wiki-page new">Nonexistent page</a>.</p>