Merge "Add a small usage comment" am: a898f0a039 am: 7f40360e32 am: 5274a841f1

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1844182

Change-Id: I67f8526e4b959fc93ee7be5b5f83e55cf5d63c1d