Update clang docs since the old text was pre-Win-clang


Change-Id: I9ce1985082125ab6099f3576d6742aaed73d21d7
Reviewed-on: https://chromium-review.googlesource.com/958165
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#542487}
1 file changed