Rewrite readmes

[jsoref]

Description

Fix various grammatical elements in the readmes

Motivation and Context

The content needed an editor to review it.

How Has This Been Tested?

• I checked a number of the links (a couple were broken).
• I fed some of the content to app.grammarly.com

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Documentation (add or update README or docs)

Checklist:

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[lvpx]

Excellent effort on fixing these @jsoref 💯

[bishal-pdMSFT]

The content needed an editor to review it.

So true :)

Thanks @jsoref for opening this PR and making really good suggestions. I have left a couple comments.

[jsoref]

@bishal-pdMSFT: if you're ok w/ the one swap to naming, I'll rebase w/ that change -- (and try to drop the ToC mess...)