qtcreator-faq.qdoc: Remove obsolete qtc-debugging-helper.

Change-Id: Ife4a32d689297d58987b10cfea617760177b9ac9
Reviewed-by: hjk <hjk@theqtcompany.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@theqtcompany.com>

doc/src/howto/qtcreator-faq.qdoc

@@ -115,8 +115,6 @@
 
         \li qtcreator
 
-        \li qtc-debugging-helper
-
         \li qtc-qmldump
 
     \endlist