a11y: Clarify AccessibleEventId::ROLE_CHANGED doc

Mention that old and new value don't need to be
set in this kind of event and how the new role
can be retrieved.

Change-Id: Iefde16a91b71af87feccb5ec2e6a32e682d60b4c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/154987
Reviewed-by: Colomban Wendling <cwendling@hypra.fr>
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

0 files changed, 0 insertions, 0 deletions