DOCS-144 - Commit scope comparisons - first draft

[djw-m]

What Changed?

First draft of content with other changes for bringing in sync with actuality.

[github-actions[bot]]

🚀 Deployed on https://deploy-preview-5349--edb-docs-staging.netlify.app

[vaijayanti-b]

I have just corrected two statements which were inaccurate. @PJMODOS could you confirm if we should be adding this detail or you see another way to summarize this and present? Also, I have not 100% sure of the feature vs postgres version matrix here. It may be good if someone else takes a look.