DOC: add to devguide how to deal with updating release notes.
DOC: add to devguide how to deal with updating release notes.

[ci skip]

vigna/scipy,nmayorov/scipy,gertingold/scipy,ilayn/scipy,gfyoung/scipy,mdhaber/scipy,Stefan-Endres/scipy,jamestwebber/scipy,matthew-brett/scipy,arokem/scipy,perimosocordiae/scipy,Stefan-Endres/scipy,vigna/scipy,grlee77/scipy,scipy/scipy,nmayorov/scipy,aarchiba/scipy,Stefan-Endres/scipy,Eric89GXL/scipy,nmayorov/scipy,endolith/scipy,mdhaber/scipy,person142/scipy,andyfaff/scipy,zerothi/scipy,mdhaber/scipy,Stefan-Endres/scipy,nmayorov/scipy,tylerjereddy/scipy,perimosocordiae/scipy,endolith/scipy,anntzer/scipy,perimosocordiae/scipy,tylerjereddy/scipy,pizzathief/scipy,aarchiba/scipy,person142/scipy,ilayn/scipy,endolith/scipy,matthew-brett/scipy,andyfaff/scipy,anntzer/scipy,endolith/scipy,aarchiba/scipy,arokem/scipy,rgommers/scipy,endolith/scipy,grlee77/scipy,pizzathief/scipy,Eric89GXL/scipy,vigna/scipy,person142/scipy,WarrenWeckesser/scipy,Stefan-Endres/scipy,e-q/scipy,zerothi/scipy,perimosocordiae/scipy,gfyoung/scipy,lhilt/scipy,zerothi/scipy,scipy/scipy,aarchiba/scipy,ilayn/scipy,gfyoung/scipy,jor-/scipy,gertingold/scipy,Eric89GXL/scipy,gertingold/scipy,matthew-brett/scipy,endolith/scipy,Eric89GXL/scipy,perimosocordiae/scipy,anntzer/scipy,rgommers/scipy,aeklant/scipy,zerothi/scipy,tylerjereddy/scipy,scipy/scipy,WarrenWeckesser/scipy,grlee77/scipy,jamestwebber/scipy,e-q/scipy,vigna/scipy,gertingold/scipy,jor-/scipy,aeklant/scipy,WarrenWeckesser/scipy,mdhaber/scipy,WarrenWeckesser/scipy,gfyoung/scipy,andyfaff/scipy,anntzer/scipy,Stefan-Endres/scipy,mdhaber/scipy,ilayn/scipy,aeklant/scipy,jor-/scipy,perimosocordiae/scipy,aeklant/scipy,ilayn/scipy,tylerjereddy/scipy,arokem/scipy,andyfaff/scipy,aeklant/scipy,pizzathief/scipy,e-q/scipy,pizzathief/scipy,zerothi/scipy,aarchiba/scipy,arokem/scipy,Eric89GXL/scipy,grlee77/scipy,pizzathief/scipy,anntzer/scipy,scipy/scipy,jor-/scipy,scipy/scipy,lhilt/scipy,WarrenWeckesser/scipy,gfyoung/scipy,anntzer/scipy,gertingold/scipy,lhilt/scipy,tylerjereddy/scipy,Eric89GXL/scipy,jamestwebber/scipy,lhilt/scipy,rgommers/scipy,person142/scipy,scipy/scipy,grlee77/scipy,jamestwebber/scipy,ilayn/scipy,matthew-brett/scipy,jamestwebber/scipy,rgommers/scipy,e-q/scipy,rgommers/scipy,jor-/scipy,nmayorov/scipy,zerothi/scipy,lhilt/scipy,person142/scipy,matthew-brett/scipy,vigna/scipy,andyfaff/scipy,mdhaber/scipy,WarrenWeckesser/scipy,arokem/scipy,e-q/scipy,andyfaff/scipy