Here's one, it's not even a manual, just a product description:
Low sprocket_Max. 28T Low sprocket_Min. 23T
Or this, from the contents of the 5800 etc derailleur dealers manual:Chain length.. „ Assemble with sprocket max 27T or less ... „ Assemble with sprocket max 28T or more
Or page 8 of this, the actual manual:
Derailleur installation: Chain length
That enough?