Fix out of date comment in the APF Arp filter am: 72488ca020 am: ef20186283

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/2840298

Change-Id: I24a10bedce976c3332b7d6e2c9ac3b629a777bc5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>