QmlProfiler: Fix documentation link for setting up debugging

Link directly to the page where the setup is described (qml profiler
page just links to it).

Change-Id: Ibe88f1b2269c90e868aab5272b01e337956d8e46
Reviewed-on: http://codereview.qt.nokia.com/2510


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Christiaan Janssen <christiaan.janssen@nokia.com>