DOC: Add a release note for the new `nan<x>`parameters
DOC: Add a release note for the new `nan<x>`parameters

numpy/numpy,pdebuyl/numpy,charris/numpy,jakirkham/numpy,mhvk/numpy,mhvk/numpy,numpy/numpy,numpy/numpy,mhvk/numpy,jakirkham/numpy,pdebuyl/numpy,charris/numpy,endolith/numpy,numpy/numpy,seberg/numpy,anntzer/numpy,jakirkham/numpy,rgommers/numpy,endolith/numpy,mattip/numpy,mhvk/numpy,seberg/numpy,seberg/numpy,jakirkham/numpy,seberg/numpy,endolith/numpy,mattip/numpy,mattip/numpy,pdebuyl/numpy,rgommers/numpy,rgommers/numpy,charris/numpy,anntzer/numpy,mhvk/numpy,charris/numpy,pdebuyl/numpy,rgommers/numpy,anntzer/numpy,endolith/numpy,anntzer/numpy,jakirkham/numpy,mattip/numpy