Fix and annotate octopus generator fiddles

I was showing these off to students and realized the animated one
was timing out and both could use some commentary to help explain
how it works.

Change-Id: I050058043ea9dfd42cd9f971e9a17db27cf391a1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/939596
Commit-Queue: Eric Boren <borenet@google.com>
Commit-Queue: Kaylee Lubick <kjlubick@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
Auto-Submit: Kaylee Lubick <kjlubick@google.com>
2 files changed