Merge "Document AARImportProperties fields" am: 08e0f96841

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2063168

Change-Id: I00aac5a7d55641b2be6135cfd95839519a405617
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>