docs: Updated Support page for L Developer Preview.
docs: Updated Support page for L Developer Preview.

Change-Id: Ib890188994cf4f23b20ec7d037db368bac2b620b

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