C++: fix typo

Change-Id: I57394be40b85eb907d9c7d0ebb713685f9651a4d
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>
CppEditor: fix typo

Change-Id: I86abdc7ec79c86e8007a3e994627ab0e51b3ff48
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>