Doc: fix typo in QXmlStreamNamespaceDeclaration[s]

Change-Id: I2b6c0fc21152a06a7c401dfd0ac3141643c5f81b
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
CMake: Fix handling of insignificant_test.

The test should still be run, even though it is insignificant.

Change-Id: I6a3853e2b0e9670152b4f329dbceed2986a7e008
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>