Update TimingAttackAgainstHeader.qhelp

Author: ahmed-farid-dev

java/ql/src/experimental/Security/CWE/CWE-208/TimingAttackAgainstHeader.qhelp

@@ -22,6 +22,6 @@ and does not depend on the contents of the arrays.
 The following example uses <code>Arrays.equals()</code> method for validating a csrf token.
 This method implements a non-constant-time algorithm. The example also demonstrates validation using a safe constant-time algorithm.
 </p>
-<sample src="csrfComparison.java" />
+<sample src="ComparingValueOfSensetiveHeader.java" />
 </qhelp>