docs: Updated L Preview Highlights (hopefully final).
docs: Updated L Preview Highlights (hopefully final).

Change-Id: Ife51fb950b0e3c7f21e69024c435ca62e6906d5b

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