docs: linting section

Thanks for this very cool tool 🎉

I am trying to set up custom linting rules and I found it a bit confusing, and I would like to provide feedback on the docs.

About the string-matcher property:

• It does not seem to be published on https://docs.redoc.ly
• I did not understand where to find the possible values for the on field, or how to compose the value.

On the website:

• The https://docs.redoc.ly/cli/configuration/reference-docs/index.md link leads to a 404.

I’d be happy to send out a PR to update once we get answers here 🙂

[adamaltman]

@ArtFlag we released a beta, as well as beta docs too.

[adamaltman]

We got some feedback on the docs that how-to guides would be helpful. I made one for a decorator:

https://redoc.ly/docs/resources/hide-apis/

However, I need to make one for a regular rule too.