Doc change: fix typo in policy docs.
Doc change: fix typo in policy docs.

Change-Id: Ic9df2511f50d9ead2dcbf4353f387e9106ce4222

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