add api level 13 flag for docs
add api level 13 flag for docs

Change-Id: I03a7739c923b1f38de6b4e77374daed438559548

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