Updates documentation mentioning all IP interfaces are available. am: ecce9d3a28 am: 92c5a38a52 am: d0a13af887

Original change: https://googleplex-android-review.googlesource.com/c/platform/libcore/+/10381713

Change-Id: I5c588a8cd7761e1f0eed94f94122bc9f5de7c90c