Merged r5614 from trunk.

Fix a typo in public/help/wiki_syntax_detailed.html.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/1.1-stable@5616 e93f8b46-1217-0410-a6f0-8f06a7374b81

public/help/wiki_syntax_detailed.html

@@ -200,7 +200,7 @@ p>. right aligned
 p=. centered
 </pre>
 
-        <p style="text-align:center;">This is centered paragraph.</p>
+        <p style="text-align:center;">This is a centered paragraph.</p>
 
 
         <h3><a name="10" class="wiki-page"></a>Blockquotes</h3>