Rename shouldUseDefaultUnfoldTransition attribute and update docs

Renames the shouldUseDefaultUnfoldTransition attribute
name to use more generic
shouldUseDefaultDeviceStateChangeTransition name as
the transition could be used on different form factors
depending on the OEMs.

Test: manual
Fixes: 200730817
Fixes: 200698833
Change-Id: I1c5d755f76f455475471fc893d4748c6adf51b8c