Update theme documentation a bit.
Update theme documentation a bit.

Change-Id: I3dbb2785973fe2618033a3956b99f1100a46b054

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