Doc: Mentioned about native Android style support in 5.4

Corrected a typo as well.

Change-Id: I5e60e4a43ed029a08a1c563e513e38e7a59197ff
Reviewed-by: Sami Makkonen <sami.makkonen@digia.com>
Reviewed-by: J-P Nurmi <jpnurmi@theqtcompany.com>