DOC: clarify that these are minimum support guide lines
DOC: clarify that these are minimum support guide lines

Projects that want to support longer time windows can, but this NEP is
setting a minimum floor for the support window.

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