redirect adt guide to release notes to consolidate the deprecation message. related deletion of file: https://critique.corp.google.com/#review/123463890
am: d6c76ddc51

* commit 'd6c76ddc51a1b607c50d8e443a7affb9b2e0e1b6':
  redirect adt guide to release notes to consolidate the deprecation message. related deletion of file: https://critique.corp.google.com/#review/123463890

Change-Id: Ia14317cc6a292fcda6328d96660db0eda5757e12