Doc: Fix QUrl conversion details

Task-number: QTBUG-33360

Change-Id: I2f6889d798c6c10f1412f5adb69dd0362ac790fb
Reviewed-by: Alan Alpert <aalpert@blackberry.com>
Doc: Fix typos

Task-number: QTBUG-33360
Change-Id: I913c14d3d6a90d2c20e40e246ad11f50a26c3ad9
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>