Merge "Strike unclear comment, 12.3 https://groups.google.com/a/webmproject.org/group/codec-devel/browse_thread/thread/d76485da84a72029# Change-Id: I5ebd987143060135531f4c8d7b13f53b079a6b96 modified: text_src/12.03__vp8-bitstream__luma-prediction.txt"