am 3a5ce8a: am 04c72b4: AI 148812: revise the AppWidget developer guide 

Merge commit '3a5ce8a92965db6d6f59517aef3d7bc02ce117ed'

* commit '3a5ce8a92965db6d6f59517aef3d7bc02ce117ed':
  AI 148812: revise the AppWidget developer guide documentation