- Document internal namespace
- Various trivial fixes

Bug: chromium:1056170
Change-Id: If527d491a37d7ccd0aa4ff829ccc5dc06c02da38
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2246569
Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68349}