Document all enum values
This ensures that Doxygen doesn't omit any enum values in the detailed documentation of the enums.
See https://api.kde.org/frameworks/kwidgetsaddons/html/namespaceKMessageBox.html#a7b65482f7d03a391aff64c73f7cae32a and https://api.kde.org/frameworks/kwidgetsaddons/html/classKMessageDialog.html#ad96a0aee68d41b6a153020b01ee61813 for the result of undocumented enum values.
Feel free to suggest alternative documentation texts.