Doc: Updated description of QMainWindow::unifiedTitleAndToolBarOnMac to include info on Cocoa.
Doc: Updated description of QMainWindow::unifiedTitleAndToolBarOnMac
to include info on Cocoa.

Task-number: 252658
Reviewed-by: Trenton Schulz

KDE/qt,igor-sfdc/qt-wk,RLovelett/qt,RLovelett/qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,radekp/qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,igor-sfdc/qt-wk,igor-sfdc/qt-wk,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,RLovelett/qt,RLovelett/qt,igor-sfdc/qt-wk,radekp/qt,radekp/qt,KDE/qt,igor-sfdc/qt-wk,RLovelett/qt,RLovelett/qt,RLovelett/qt,KDE/qt,RLovelett/qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,KDE/qt,pruiz/wkhtmltopdf-qt,radekp/qt,KDE/qt,pruiz/wkhtmltopdf-qt,RLovelett/qt,KDE/qt,KDE/qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,radekp/qt,radekp/qt,radekp/qt,RLovelett/qt,pruiz/wkhtmltopdf-qt,radekp/qt,pruiz/wkhtmltopdf-qt,radekp/qt,RLovelett/qt,pruiz/wkhtmltopdf-qt,KDE/qt,radekp/qt