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This change adds a note and an example to clarify why it's safe to
return read-only views in struct traits accessors.

Change-Id: I0b6b646de10dd01fe5ae347f48d9a119b6e118a6
Reviewed-on: https://chromium-review.googlesource.com/c/1316787
Commit-Queue: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#605837}