Clarify scope, highlight determinism vs. nondeterminism, fix typos

[carsonkahn-external]

Update inspired by https://news.ycombinator.com/item?id=48051562

What

Clarify scope, highlight determinism vs. nondeterminism, fix typos in README

Why

Adoption

How

n/a

Test Plan

n/a (or else CI/CD to catch)

Checklist

• My code follows the project's coding style
• I have reviewed my own diff
• I have added/updated documentation as needed
• This change does not introduce new warnings

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @carsonkahn-external to sign the Salesforce Inc. Contributor License Agreement.

[carsonkahn-external]

Thanks for the contribution! Before we can merge this, we need @carsonkahn-external to sign the Salesforce Inc. Contributor License Agreement.

Done. But I work at Salesforce: carson.kahn@salesforce.com /cc @elimchayseng

[setu4993]

Thanks for the contribution! Before we can merge this, we need @carsonkahn-external to sign the Salesforce Inc. Contributor License Agreement.

Done. But I work at Salesforce: carson.kahn@salesforce.com /cc @elimchayseng

@carsonkahn-external : Doesn't look like it's signed? Still needs that.

[carsonkahn-external]

@carsonkahn-external : Doesn't look like it's signed? Still needs that.

@setu4993 Hmm:

Any ideas…?

[carsonkahn-external]

@setu4993 Checking in re: above