fix include generation

Over zealous requirement to have periods at end
of every sentence relaxed. Removed ancient comments
from SkRRect.h. Add support for understanding " = default".

TBR=caryclark@google.com

Docs-Preview: https://skia.org/?cl=141120
Bug: skia:6818
Change-Id: I184533539803238ed386863f9029cb68a27e1d6a
Reviewed-on: https://skia-review.googlesource.com/141120
Commit-Queue: Cary Clark <caryclark@skia.org>
Reviewed-by: Cary Clark <caryclark@skia.org>
14 files changed