Document "disable default Beam" meta-data entry.
Document "disable default Beam" meta-data entry.

Change-Id: Icaa767ee37fcca08b1ff5143eb94cf8e66be840c

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base