remove paint flatten unflatten from generated docs

No-Try: true
Docs-Preview: https://skia.org/?cl=114014
Bug: skia:6898
Change-Id: Ic53e3b9041576888a1d533cd9ef0f575e35cb0bc
Reviewed-on: https://skia-review.googlesource.com/114014
Commit-Queue: Cary Clark <caryclark@skia.org>
Reviewed-by: Cary Clark <caryclark@skia.org>
1 file changed