Merge "Update device-entry docs + add glossary" into tm-dev am: 35772beb am: 9e8bda59

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



Change-Id: I982dfb38fd839570edfa62499c3650f65c621ac8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>