Improve documentation
Improve wording consistency, fix types, add more information about default value, ...
Following component were reworked during this batch:
- AbstractItemViewHeader.qml
- Action.qml
- ActionTextField.qml
- ActionToolBar.qml
- ApplicationItem.qml
- ApplicationWindow.qml
- Avatar.qml
- BasicListItem.qml
- Card.qml
- CardsGridView.qml
- CardsLayout.qml