API dox: document overloads of KColorSchemeManager::createSchemeSelectionMenu
The behaviour change WRT preset icon & text is better documented, for people relying on either new or old behaviour and being surprised otherwise (e.g. when using createSchemeSelectionMenu(const QString &selectedSchemeName, QObject *parent) and relying on newer default icon & text as seen when using latest KF, but then running into an empty menu entry with KF < 5.67).
Let's be nice to KF.using developers and put more stuff into the API contract, instead of forcing them to look into the sources & history :)