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

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

Change-Id: Ic9201f0e0a3b48561926023524eb308abd4cde91