Viewer doc cleanup.

No-Try: true
Docs-Preview: https://skia.org/?cl=75360
Change-Id: I915ae012e0f80ac2595ec9088ae8339b337e860e
Reviewed-on: https://skia-review.googlesource.com/75360
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed