Where is the up-to-date documentation for Safari Web Inspector?

Out-of-date documentation for Safari's Web Inspector can be found here

The recommendation for up-to-date documentation is to visit Safari Developer Help.

However, no search criteria that I can conjure leads me to up-to-date documentation.

So... Where is the up-to-date documentation for Safari Web Inspector?

[Re-Titled by Moderator]

Original Title: Safari Web Inspector documentation