DOC: special: Update examples, notes in `betainc` docsting
DOC: special: Update examples, notes in `betainc` docsting

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