Remove JSF XSS Example

Per previous commit, no need for a top-level JSF example

Author: smowton

java/ql/src/Security/CWE/CWE-079/XSS.qhelp

@@ -23,15 +23,6 @@ leaving the website vulnerable to cross-site scripting.</p>
 
 <sample src="XSS.java" />
 
-</example>
-
-<example>
-
-<p>The following example shows the page parameter being written directly to a custom JSF renderer
-of UI components, which leaves the website vulnerable to cross-site scripting.</p>
-
-<sample src="JsfXSS.java" />
-
 </example>
 <references>