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

* commit '3152ead0f8cb5994100a423b47907db06d8e0d7b':
  redirect adt guide to release notes to consolidate the deprecation message. related deletion of file: https://critique.corp.google.com/#review/123463890

Change-Id: I8ec4aee36c2f39f9590fe94ffa8fa7b8da90cf43