Suggest and ease creation of document from what started as a predicate.

If someone starts creating a "predicate" that is actually several predicates, the UI could detect it and enable a button to create and attach a document instead, from which predicates can be extracted.

The simplest detection could just look for cases where uses writes multiple sentences.

Another detection for the "document switch" could be if user types a question (e.g. ends with a question mark).