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Update and clean up components/invalidations/impl/README.md

Bug: 1054367
Change-Id: Ibb282217b3ac905d107035b020cbed1a33103cd0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089752
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Maksim Moskvitin <mmoskvitin@google.com>
Cr-Commit-Position: refs/heads/master@{#747617}