am 99fd8c21: am 74d4638e: am a44583c1: am 8e4e5549: am d9019dd2: Doc change: Mention ratings in app stats intro, mention proguard in pub checklist, align terminology wrt native platform filtering.

* commit '99fd8c21caae6f01c9a14541505832d66c1dff89':
  Doc change: Mention ratings in app stats intro, mention proguard in pub checklist, align terminology wrt native platform filtering.