Merge "profcollect: Add docs for profcollect" am: 1b8ffa63e2 am: 5b9336b7b2

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/1788113

Change-Id: I05a0c2f49b9859f14df182bea5a9c3b44ce9b53d