Merge "Update device-entry docs + add glossary" into tm-dev am: 35772beb

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17567678



Change-Id: I5282d5768bef9b34796291a305834e089695b336
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>