DOC: Reorder the constants to have the most useful first
DOC: Reorder the constants to have the most useful first

Previously the constants at the top of the page said words to the effect of "use the one at the bottom of this page instead".
Let's just show users those ones first to start with.

This commit only re-orders these constants, it does not change any of the descriptions, despite the diff appearing to show that

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