Update documentation that covers `daniel-shuy/renovate` Circle CI Orb

Describe the proposed change(s).

Affected page: https://docs.renovatebot.com/examples/self-hosting/#circleci

The 3.0.0 version of the daniel-shuy/renovate Orb has breaking changes ¹:

Move self-hosted configuration file validation to a new validate-self-hosted-config job. This is a breaking change. If you were using the validate-config job to validate self-hosted configuration files, use the new validate-self-hosted-config job instead.

If we want to bump the version of the Orb in our docs to the latest 3.x range, we should update our docs/examples as well, I think.

This issue is to get help on what we should change in the docs, as I don't use this Orb or Circle CI. 😉

Found this issue while working on PR #13426.

Footnotes

1. https://github.com/daniel-shuy/renovate-orb/releases ↩