fix capitalization

Fix 'arcs' at sentence start to Arcs.
This fix corrected other capitalizations as well,
and exposed some mis-capitalizations in the bmh
doc.

R=brianosman@google.com
TBR=reed@google.com
Bug: skia:
Change-Id: I4d51388556f7e8ff868a9236ce76745915560327
Reviewed-on: https://skia-review.googlesource.com/28241
Commit-Queue: Cary Clark <caryclark@skia.org>
Reviewed-by: Cary Clark <caryclark@skia.org>
4 files changed