> the problem with this sentence is, that not everyone understands it > as a joke. Some may think it is meant literally and then wonder how > one can write this into a professional documentation. If all agree > that this sentence should be kept--okay, but there is a risk that > from time to time one may get upset when reading it and getting it > wrong.
You might enjoy https://en.wikipedia.org/wiki/Fictitious_entry which is something similar: funny entries in completely serious encyclopedies and the like. Werner