Doc change: add note about future instruction set support.
Doc change: add note about future instruction set support.

Change-Id: If954c1020301f5935c8d9328a531afdddbdad8db

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