DOC: address a few more review comments on downstream packaging guide
DOC: address a few more review comments on downstream packaging guide

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