Android Studio: Update docs

Instrumentation code is only available for editing purposes.

TBR=estevenson@chromium.org

Bug: 620034
Change-Id: I32d2b3b29bd61a2b206f6ccca80cfb9cde71a292
Reviewed-on: https://chromium-review.googlesource.com/1099177
Commit-Queue: Peter Wen <wnwen@chromium.org>
Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566898}
1 file changed