Clarify section on alternative array types
Clarify section on alternative array types

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