redirect adt guide to release notes to consolidate the deprecation message. related deletion of file: https://critique.corp.google.com/#review/123463890 am: d6c76ddc51 am: 3152ead0f8 am: c26b8afd35
am: f92f6351b6
* commit 'f92f6351b6bab702e986aa191f84a4fc831d36ad':
Change-Id: Ibad1614f55c787f2585bf824855a2d69297b414f
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