Wifi: Add documentation for MacAddress

This commit adds documentation for MacAddress type definition.

Bug: 148617829
Test: Build successful
Change-Id: I535b78ac6826a478e8bbe10c2eced30e64f05724
diff --git a/current.txt b/current.txt
index 3be26c2..fae8d62 100644
--- a/current.txt
+++ b/current.txt
@@ -675,7 +675,7 @@
 3646950b10f7cacdafca13609b0e18496cea942f3bdfe920494661856eff48bb android.hardware.neuralnetworks@1.3::types
 3e01d4446cd69fd1c48f8572efd97487bc179564b32bd795800b97bbe10be37b android.hardware.wifi@1.4::IWifi
 c67aaf26a7a40d14ea61e70e20afacbd0bb906df1704d585ac8599fbb69dd44b android.hardware.wifi.hostapd@1.2::IHostapd
-11f6448d15336361180391c8ebcdfd2d7cf77b3782d577e594d583aadc9c2877 android.hardware.wifi.hostapd@1.2::types
+2b5a7ea572b736030c64a3b4043af244425477c4672301780fe15aba5ed393d9 android.hardware.wifi.hostapd@1.2::types
 a64467bae843569f0d465c5be7f0c7a5b987985b55a3ef4794dd5afc68538650 android.hardware.wifi.supplicant@1.3::ISupplicant
 8aed0a8e03e7a67bfdfb78ad7529a9ae95bea36e6060473b204c89d772522126 android.hardware.wifi.supplicant@1.3::ISupplicantStaIface
 def77c7db95d374f11a111bfc4ed60f92451303642a43276c4e291988fcee625 android.hardware.wifi.supplicant@1.3::ISupplicantStaIfaceCallback