android: Update docs to use ChromePublic/Trichrome

Monochrome is deprecated and should no longer be recommended in docs.
Currently Trichrome is the shipped/released version.

This CL updates build instructions, tool documentation, and metrics to
reference `chrome_public_bundle` or `TrichromeChrome` instead of
`monochrome_public_bundle`.

R=agrieve@chromium.org

Bug: 463725082
Change-Id: Icc95fb1c970734aafc3fc3d6b6d9876a040b520a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7203883
Auto-Submit: Peter Wen <wnwen@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Owners-Override: Peter Wen <wnwen@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1550599}
NOKEYCHECK=True
GitOrigin-RevId: 9bfce0189862ad2bb147d835dd919501f3ac6295