Fix doc references to "android.backup" to the new "android.app.backup"
Fix doc references to "android.backup" to the new "android.app.backup"

Change-Id: Ia347590a374f7e0b8928b0673dc10d55fe785e73

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