Fix out of date comment in the APF Arp filter am: 72488ca020 am: 48c8718a4d

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

Change-Id: If142255dd7e25552f2948287f8c4e2b4b3ff1cce
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>