Remove SkPath::RawIter from docs and examples

Change-Id: Ibfcc596855f35a1d08d85e602c7ef7ab9c39a315
Docs-Preview: https://skia.org/?cl=287893
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/287893
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
6 files changed