fwmark - document config_networkWakeupPacketMark Test: TreeHugger Signed-off-by: Maciej Żenczykowski <maze@google.com> (cherry picked from https://android-review.googlesource.com/q/commit:cfb3745c5bb0c492d1fe80c75dd0162e2e0a9d55) Merged-In: I2e980fc0f81b7d197a08101ada38e1a0d2dc7612 Change-Id: I2e980fc0f81b7d197a08101ada38e1a0d2dc7612 Bug: 284334830