NEP: Improve Value Based Casting paragraph in NEP 40 (#16000)
NEP: Improve Value Based Casting paragraph in NEP 40 (#16000)

* DOC: Improve Value Based Casting doc

* Update doc/neps/nep-0040-legacy-datatype-impl.rst

Co-Authored-By: Ross Barnowski <e9fb290bfd0a4406872fd6103425d9efafcfa051@berkeley.edu>

* Update doc/neps/nep-0040-legacy-datatype-impl.rst

Co-Authored-By: Ross Barnowski <e9fb290bfd0a4406872fd6103425d9efafcfa051@berkeley.edu>

Co-authored-by: Ross Barnowski <e9fb290bfd0a4406872fd6103425d9efafcfa051@berkeley.edu>
endolith/numpy,pbrod/numpy,anntzer/numpy,anntzer/numpy,mhvk/numpy,mattip/numpy,grlee77/numpy,madphysicist/numpy,rgommers/numpy,jakirkham/numpy,seberg/numpy,pbrod/numpy,mhvk/numpy,grlee77/numpy,charris/numpy,grlee77/numpy,grlee77/numpy,simongibbons/numpy,seberg/numpy,jakirkham/numpy,anntzer/numpy,jakirkham/numpy,numpy/numpy,simongibbons/numpy,charris/numpy,abalkin/numpy,grlee77/numpy,endolith/numpy,mhvk/numpy,seberg/numpy,seberg/numpy,madphysicist/numpy,mhvk/numpy,endolith/numpy,rgommers/numpy,mattip/numpy,pdebuyl/numpy,madphysicist/numpy,simongibbons/numpy,charris/numpy,mattip/numpy,simongibbons/numpy,pdebuyl/numpy,jakirkham/numpy,abalkin/numpy,pdebuyl/numpy,charris/numpy,pbrod/numpy,madphysicist/numpy,endolith/numpy,pdebuyl/numpy,numpy/numpy,mhvk/numpy,rgommers/numpy,jakirkham/numpy,simongibbons/numpy,pbrod/numpy,pbrod/numpy,anntzer/numpy,abalkin/numpy,madphysicist/numpy,mattip/numpy,rgommers/numpy,numpy/numpy,numpy/numpy