Minor comment fixes in COLRv1 GM and implementation

Compare https://skia-review.googlesource.com/c/skia/+/300558/55#message-c36225fec2e0604cdaeb72022af85e55ab4b3ee3

Change-Id: I0aa5ff5ca26d5f80fbcfffd6c31cc0769c677a14
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/466357
Auto-Submit: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
2 files changed