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

* commit 'c26b8afd35c2debf14cdefb6120b908cfb9ef5c3':
  redirect adt guide to release notes to consolidate the deprecation message. related deletion of file: https://critique.corp.google.com/#review/123463890

Change-Id: I3588745db102813ca7fd2c3d7f646a8c1ed3378e