Doc: using debugging helpers is now the default option

Disabling the option is described in the Debugging Helpers
topic.

Change-Id: Idead0835f0064477338a7b8a74bbbec143abf389
Reviewed-by: hjk <hjk121@nokiamail.com>

doc/src/debugger/creator-debugger.qdoc

@@ -656,20 +656,6 @@
     The \gui{Locals and Expressions} view also provides access to the most
     powerful feature of the debugger: comprehensive display of data belonging
     to Qt's basic objects.
-
-    To enable Qt's basic objects data display feature:
-
-    \list
-
-        \li Select \gui Tools > \gui {Options} > \gui Debugger >
-            \gui{Debugging Helper} and check the \gui{Use Debugging Helper}
-            checkbox.
-
-        \li The \gui{Locals and Expressions} view is reorganized to provide a
-            high-level view of the objects.
-
-    \endlist
-
     For example, in case of QObject, instead of displaying a pointer to some
     private data structure, you see a list of children, signals and slots.