DOC: some more tweaks of roadmap text based on review comments.
DOC: some more tweaks of roadmap text based on review comments.

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numpy/numpy,pizzathief/numpy,rgommers/numpy,mattip/numpy,jakirkham/numpy,ahaldane/numpy,grlee77/numpy,anntzer/numpy,jorisvandenbossche/numpy,endolith/numpy,simongibbons/numpy,grlee77/numpy,abalkin/numpy,charris/numpy,endolith/numpy,ahaldane/numpy,pdebuyl/numpy,mhvk/numpy,seberg/numpy,MSeifert04/numpy,rgommers/numpy,jorisvandenbossche/numpy,MSeifert04/numpy,grlee77/numpy,pizzathief/numpy,WarrenWeckesser/numpy,ahaldane/numpy,jorisvandenbossche/numpy,pbrod/numpy,rgommers/numpy,anntzer/numpy,simongibbons/numpy,charris/numpy,madphysicist/numpy,madphysicist/numpy,numpy/numpy,jakirkham/numpy,WarrenWeckesser/numpy,ahaldane/numpy,WarrenWeckesser/numpy,charris/numpy,mattip/numpy,numpy/numpy,anntzer/numpy,seberg/numpy,pdebuyl/numpy,endolith/numpy,pizzathief/numpy,mhvk/numpy,pbrod/numpy,pbrod/numpy,abalkin/numpy,simongibbons/numpy,mhvk/numpy,jorisvandenbossche/numpy,anntzer/numpy,jakirkham/numpy,pizzathief/numpy,seberg/numpy,abalkin/numpy,WarrenWeckesser/numpy,MSeifert04/numpy,grlee77/numpy,mattip/numpy,simongibbons/numpy,WarrenWeckesser/numpy,jorisvandenbossche/numpy,madphysicist/numpy,seberg/numpy,jakirkham/numpy,MSeifert04/numpy,ahaldane/numpy,pbrod/numpy,rgommers/numpy,pdebuyl/numpy,jakirkham/numpy,madphysicist/numpy,madphysicist/numpy,mhvk/numpy,mhvk/numpy,grlee77/numpy,MSeifert04/numpy,mattip/numpy,numpy/numpy,pdebuyl/numpy,endolith/numpy,charris/numpy,simongibbons/numpy,pizzathief/numpy,pbrod/numpy