Remove leftover wording from preprocessing, restore limitation note #267
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We removed the preprocessing rules, including those related to
using the entire instance value, and made a note of the limitation
and intent to remove it in a future draft.
This stray phrase should have been removed at that time.
Also add a cref acknowledging the limitations and further work
needed in this area. There was such a cref in the previous
draft and I had thought I'd updated it rather than deleting it,
but apparently not. It was a good idea, let's keep it.