fix docs for fitsInBytes

Bug: skia:
Change-Id: I78c4432ff96e7c7886e5c996dc02d3a9505b6994
Reviewed-on: https://skia-review.googlesource.com/c/196507
Reviewed-by: Stephan Altmueller <stephana@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2 files changed