Doc: Fix module name used in documentation filter

Qt WebKit Examples creates a filter with name 'QtWebKit'.
Change it to use the correct name so that Qt WebKit can
add its own filter.

Task-number: QTBUG-34966
Change-Id: Iad74a20d72eebf2e20309a54f633a24f8c1e3d12
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Doc: Updated url variable in qdocconf files.

In 5.2, the HTML output is in a flatter structure and when they are
hosted in qt-project.org/doc, the documentation will be found at
http://qt-project.org/doc/qt-$QT_VER

The url variable is used by projects outside of Qt 5 which need
to link to Qt 5 documentation, such as Qt Creator.

Task-number: QTBUG-34584
Change-Id: If867f487719da5cccf1b0edd91f620728885b1fd
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Merge remote-tracking branch 'origin/release' into stable

Change-Id: Ie268c1b4ad0e49393015d3a1a46785bb8c17c44a