Masayuki Igawa d2a657de0e
Update document theme and section headers
This commit updates the document theme. It is clear, simple, up-to-date
and beautiful. And this commit also updates section headers to fix the
document index.

Change-Id: Ia1e8e16e5f5ddb06e4c4ccb4979b0750b88a4db4
2017-05-09 15:34:45 -04:00
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