magic-removal: missing options from old query language

[hugo]

limit= and complex= are gone - but there is no doc on where they are gone. From the source I grok that limit= is gone to slicing, but since that's a bit different in behaviour (especially with selections where you could have less than your limit of rows - before it would just return the available rows or an empty set, now it will throw an error), this should be documented. And there is no notion on what to do with complex= query parameters, how to do those (this was done with queryset combinations, right? But there should be a sample in the docs).