docs: small grammatical and typo corrections; some suggested rewording

[kentbull]

This includes:

1. A suggested overview statement of the KRAM mechanism given the discussion this morning.
2. A number of grammatical and typo fixes that stood out today while I read the paper.
3. Some suggested rewording for clarity. Please correct any misunderstandings I had. I tried my best at clarifying confusing points or adding wording to sentences that seemed incomplete or not understandable by me.
4. Some titling changes

When I review papers I favor adding in Oxford commas and commas in general, which is why I included so many in this PR.