Update CLF documentation

SMPTE is working on a standard for the Academy/ASC Common LUT Format. We won't be able to copy those changes into this documentation, but we should update the specification to be informative for the process nodes as those haven't changed in function.

More friendly examples and subpages in a more digestable size might also be beneficial.

This has been done similarly in the past for the ACES specification document, superceded by SMPTE ST 2065-1, etc.