Adds suggestions for how to resolve the most common messages produced by the documentation linter.
Adds links to the Proselint and other style tests to the new documentation.
Updates pullapprove and navigation.
PR Close#47019
This update includes:
* installation directions for the current version of the Vale VSCode extension (v. 0.15.0)
* a workaround for if the current version of the extension doesn't work.
PR Close#47031
Add the configuration and style files to support documentation linting. The `README.md` file includes instructions for installation and use of the lint tool.
PR Close#46897
Bob Watson