Fix several outdated / incorrect comments in SkColorSpace

Change-Id: I21ce37126dd0ee52486c316b3b85580300c711be
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/624727
Auto-Submit: Brian Osman <brianosman@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
1 file changed