[Docs] Fix lint errors in README.md

[gitbrent]

PR Creator Checklist

Ensure you've checked the following before submitting your PR:

• You've discussed making your changes with a member of the dev team per contributing rules in the README
• Your changes are free of any lint errors
• Your changes are free of any typescript errors
• You've tested your changes

Summary

Please provide a summary of what your PR does
This fixes minor linting errors such as spacing, and incorrect levels.

Screenshots

If the UI has been changed, include screenshots.
We will not review your PR without screenshots if they are applicable.

Test Plan

Please documemnt the steps required to test your PR
(check diff)