Dask method wrapper clobbers documentation

[nsmith-]

For example,

coffea/src/coffea/nanoevents/methods/vector.py

Lines 421 to 422 in 9911a49

	@dask_method
	def nearest(

ends up as https://coffea-hep.readthedocs.io/en/latest/api/coffea.nanoevents.methods.vector.LorentzVector.html#coffea.nanoevents.methods.vector.LorentzVector.nearest
claiming it is an attribute (it is not) and it has no documentation!