Added FlatSpark wiki page to Release Notes
FLEX-34657: SelectedIndices order is messed up

Signed-off-by: Erik de Bruin <erik@ixsoftware.nl>
Mustella tests to go with "FLEX-34657: SelectedIndices order is messed up"

Signed-off-by: Erik de Bruin <erik@ixsoftware.nl>