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No change to logic, only docs. This updates the commandline docs to
point to Developer UI in more spots and to remove a reference to the log
verbosifier app.

This removes a "new in M84" aside for a Dev UI feature which was
cherry-picked to M83.

This adds documentation for flag persistence and "check for WebView
updates," both of which were added in M84.

Fixed: 1058571
Test: tools/md_browser/md_browser.py
Test: Upload to gerrit > open file > click "gitiles"
Change-Id: Ia796cd84d3556fa15d6b251d18b55cde546d0609
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2186750
Commit-Queue: Hazem Ashmawy <hazems@chromium.org>
Auto-Submit: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Hazem Ashmawy <hazems@chromium.org>
Cr-Commit-Position: refs/heads/master@{#766462}