Merge "Explain why snapuserd is a static binary." am: 4bf3c13d am:...

Merge "Explain why snapuserd is a static binary." am: 4bf3c13d am: c74097cc am: 6a0eecbc am: d8d302c4

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1910141

Change-Id: I1bf7d0f2867eb02e9b85df98fcc32c7356ed399b