Update comments for Calendar ExtendedProperties.
Update comments for Calendar ExtendedProperties.

Change-Id: Id51fe946995b19f98f1745abd3c83c942779b5df

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