[w3c/ServiceWorker] Minor Readme format changes (#1376)

Minor update to the README to increase readability.

I inserted a newline between "Risk labels for impacts MVP issues" and added bullet points in various places.

Minor point, but it kind of bothered me while reading this 😄 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1376


-- Commit Summary --

  * Minor format change
  * Updated Areas & Actions to be bullet points

-- File Changes --

    M README.md (44)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1376.patch

https://github.com/w3c/ServiceWorker/pull/1376.diff


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