Add instruction to use built-in crl distribution point.

[lukasz-lobocki]

Name of feature:

Built-in crl distribution point.

Pain or issue this feature alleviates:

Alleviates the need to create and publish crl using external tools.

Why is this important to the project (if not answered above):

Is there documentation on how to use this feature? If so, where?

This is the documentation.

In what environments or workflows is this feature supported?

Any

In what environments or workflows is this feature explicitly NOT supported (if any)?

Supporting links/other PRs/issues:

https://github.com/smallstep/certificates/issues/1423 https://github.com/smallstep/certificates/issues/206#issuecomment-1530219201

💔Thank you!

[CLAassistant]

All committers have signed the CLA.