Improve MSAN docs

No-Try: true
Docs-Preview: https://skia.org/?cl=118360
Bug: skia:
Change-Id: Ic6691bc0427dd0c5e9e50efd8d5bbdad8fd0012d
Reviewed-on: https://skia-review.googlesource.com/118360
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
1 file changed