[jakarta.ee-spec] Updated spec_review_checklist.md for easier use in rev

[Scott Stark <starksm64@xxxxxxxxx>]

I updated the spec review checklist:

https://github.com/jakartaee/specification-committee/blob/master/spec_review_checklist.md

To use a format that one can paste into a spec project PR as a comment and then literally check off the items as they are reviewed to simplify validating a PR. As an example, here is the checklist I’m working on for the WebSocket PR:

https://github.com/jakartaee/specifications/pull/79#issuecomment-520442313