Doc update: minor changes to immersive lesson
Doc update: minor changes to immersive lesson

Change-Id: I4b830b1de6f92c7f5f0f1106f2f797bb891d73e2

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