bookmaker self documentation

Clean up the documentation a bit.
Clean up old bugs.
Fix deprecated and experimental wording.

TBR=caryclark@skia.org
Docs-Preview: https://skia.org/?cl=151361
Bug: skia:
Change-Id: I6b2120069b3299fc9d1a63c13bb2bdbe5cd3b236
Reviewed-on: https://skia-review.googlesource.com/151361
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Cary Clark <caryclark@google.com>
Auto-Submit: Cary Clark <caryclark@google.com>
11 files changed