Merge "Clarify API docs for getCannedTextResponses." am: fc1a08a982 am: 9626f7cc42 am: 48b97996fb am: 0108bb9b4b

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1451125

Change-Id: Id0185ea220741f93f43ebf7433d9655013f9dae9