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Screenshots:
Chrome accessibility page: https://screenshot.googleplex.com/5vU2bhoKpJvoruY
ChromeOS accessibility page: https://screenshot.googleplex.com/ALQB78FPBjvhEqD
Captions settings page: https://screenshot.googleplex.com/3LUrCWPny6kv954

AX-Relnotes: Clarified the names of captions strings in settings

Bug: 1055150
Change-Id: Ia645b35626b1e5a30e5115882362b7e0c632f60f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398980Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Cr-Commit-Position: refs/heads/master@{#804955}