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Fixes some typos and clarifies some behaviour.

Change-Id: I5fc6383c7390f908bbe8b33e0b883e704461f0b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2512489Reviewed-by: Tao Wu <wutao@chromium.org>
Commit-Queue: Michael Cui <mlcui@google.com>
Cr-Commit-Position: refs/heads/master@{#823440}