update md files

The generated web files have fallen
slightly behind the bookmaker masters,
so bring them up to date.

TBR=caryclark@google.com
No-Try: true
Docs-Preview: https://skia.org/?cl=123460
Bug: skia:6898
Change-Id: Ia630c923ed8784960e85b4ae6edb661c9113d31b
Reviewed-on: https://skia-review.googlesource.com/123460
Commit-Queue: Cary Clark <caryclark@skia.org>
Auto-Submit: Cary Clark <caryclark@skia.org>
Reviewed-by: Cary Clark <caryclark@skia.org>
4 files changed