Document the behavior of 'null' values in SharedPreferences
Document the behavior of 'null' values in SharedPreferences

Bug 7892422

Change-Id: Ib898fd0921d57871d4caecb9042c479271c7ad60

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