Support aria-roledescription in Edge. (#8449)
* Support aria-roledescription in Edge.
* Braille: honor roleText in browseMode.
* BrowseMode: only explicitly include the name of a landmark if it is not going to be already presented as part of the field.
* Edge: mark controlFields as block if if they have a particular role (grouping, paragraph or section currently). This ensures that they are appropriately presented as containers when roledescription is used.
* Update What's new
* Address review actions.
