docs: Camera JavaDoc - added xref to Camera DevGuide
docs: Camera JavaDoc - added xref to Camera DevGuide

Change-Id: I4b5faa154a63f0830717a9156b617a0199604547

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