Add some more detail on when one would want to modify from the default preprocessing #355
Description
Since baselinenowcast is now the main entry point for pre-processing, am wondering if we should make more explicit when one would want to use the default preprocess_negative_values() and that that corresponds to an assumption of monotonically increasing number of cases across delays, whereas setting preprocess = NULL relaxes this assumption, allowing the number of cases on a particular reference date to both increase and decrease across delays (e.g. negative revisions).... If so I can draft some text here or could make a separate PR. Could also put into function documentation of preprocess_negative_delays but that sort of misses the case when we would set preprocess = NULL
Originally posted by @kaitejohnson in #347 (comment)