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Change the ControlType of <figcaption> from Group to Text per
https://w3c.github.io/html-aam/#el-figcaption <figcaption>

Also update the AriaRole exposed to UIA from 'group' to 'description';
the spec doesn't comment on this but it is consistent with the current
behavior for other inline wrappers like <mark>.

Bug: 997714
Change-Id: I26c9a55bbdc02bed0707e926be332f7ebb53b27f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1769049
Commit-Queue: Kevin Babbitt <kbabbitt@microsoft.com>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#690446}