Fix synchronized query-help file

Author: miachillgood

python/ql/src/Metrics/FLinesOfDuplicatedCodeCommon.inc.qhelp

@@ -27,7 +27,7 @@ a shared library or module.
 <references> 
 
 
-<li>Wikipedia: <a href="http://en.wikipedia.org/wiki/Duplicate_code">Duplicate code</a>.</li>
+<li>Wikipedia: <a href="https://en.wikipedia.org/wiki/Duplicate_code">Duplicate code</a>.</li>
 <li>M. Fowler, <em>Refactoring</em>. Addison-Wesley, 1999.</li>