Re: AI tutor lessons for Incubator training

Hi,

I added a few minor improvements to the current lessons and added seven more lessons to https://incubator.apache.org/training/lessons.html.

The new areas are:
 - Releases: anatomy of a podling release, running a release vote, announcing and distributing.
 - Mentoring: what a mentor actually does, reading the signals, difficult conversations, and the mentor lifecycle.

Feedback/corrections welcome here.

Thanks,
Justin