Changelog: Remove duplicate entries in C++

+ fix 1 description

Change-Id: I70f7ac0651b11cdc2b9fedff35d3da8ced4e888e
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>