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This cl revises some Keyboard Shortcut Viewer (KSV) strings based on the
feedback from TC.

Bug: b/74114276, b/74085777, b/74086686, b/74114046
Test: Wait TC to verify.
Change-Id: Idb1a6a3695af135ed6a146c58f7048abfbcc4618
Reviewed-on: https://chromium-review.googlesource.com/956607Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542207}