DOC: document type of stats.chisquare/power_divergence parameters correctly.
DOC: document type of stats.chisquare/power_divergence parameters correctly.

Closes gh-2895.

trankmichael/scipy,endolith/scipy,mingwpy/scipy,tylerjereddy/scipy,endolith/scipy,futurulus/scipy,FRidh/scipy,grlee77/scipy,nmayorov/scipy,niknow/scipy,pizzathief/scipy,niknow/scipy,Kamp9/scipy,argriffing/scipy,sriki18/scipy,mingwpy/scipy,andim/scipy,vhaasteren/scipy,befelix/scipy,anntzer/scipy,mikebenfield/scipy,vanpact/scipy,nvoron23/scipy,nmayorov/scipy,sauliusl/scipy,gef756/scipy,gertingold/scipy,argriffing/scipy,befelix/scipy,newemailjdm/scipy,aarchiba/scipy,apbard/scipy,ortylp/scipy,gef756/scipy,sriki18/scipy,efiring/scipy,rmcgibbo/scipy,richardotis/scipy,efiring/scipy,mortada/scipy,vberaudi/scipy,gertingold/scipy,lhilt/scipy,mikebenfield/scipy,perimosocordiae/scipy,jonycgn/scipy,felipebetancur/scipy,Eric89GXL/scipy,mtrbean/scipy,Gillu13/scipy,futurulus/scipy,apbard/scipy,Shaswat27/scipy,haudren/scipy,cpaulik/scipy,gdooper/scipy,andyfaff/scipy,sonnyhu/scipy,gdooper/scipy,ortylp/scipy,raoulbq/scipy,scipy/scipy,futurulus/scipy,jonycgn/scipy,zaxliu/scipy,juliantaylor/scipy,rgommers/scipy,giorgiop/scipy,petebachant/scipy,matthew-brett/scipy,Srisai85/scipy,mtrbean/scipy,Gillu13/scipy,jsilter/scipy,vigna/scipy,fredrikw/scipy,minhlongdo/scipy,giorgiop/scipy,futurulus/scipy,arokem/scipy,Eric89GXL/scipy,aman-iitj/scipy,chatcannon/scipy,endolith/scipy,jseabold/scipy,jor-/scipy,perimosocordiae/scipy,gfyoung/scipy,lhilt/scipy,vberaudi/scipy,josephcslater/scipy,ortylp/scipy,niknow/scipy,WarrenWeckesser/scipy,pschella/scipy,behzadnouri/scipy,sonnyhu/scipy,efiring/scipy,WarrenWeckesser/scipy,Srisai85/scipy,pyramania/scipy,nvoron23/scipy,maciejkula/scipy,anntzer/scipy,anielsen001/scipy,newemailjdm/scipy,giorgiop/scipy,jonycgn/scipy,Dapid/scipy,pbrod/scipy,vhaasteren/scipy,nmayorov/scipy,felipebetancur/scipy,dominicelse/scipy,woodscn/scipy,larsmans/scipy,vhaasteren/scipy,hainm/scipy,witcxc/scipy,cpaulik/scipy,nvoron23/scipy,cpaulik/scipy,jamestwebber/scipy,WillieMaddox/scipy,jjhelmus/scipy,mgaitan/scipy,ChanderG/scipy,Srisai85/scipy,lhilt/scipy,witcxc/scipy,ales-erjavec/scipy,scipy/scipy,zerothi/scipy,maciejkula/scipy,anntzer/scipy,jseabold/scipy,pschella/scipy,larsmans/scipy,jsilter/scipy,fredrikw/scipy,Dapid/scipy,aman-iitj/scipy,rmcgibbo/scipy,petebachant/scipy,sriki18/scipy,ChanderG/scipy,Newman101/scipy,maciejkula/scipy,maniteja123/scipy,gef756/scipy,gfyoung/scipy,chatcannon/scipy,dominicelse/scipy,surhudm/scipy,ndchorley/scipy,matthew-brett/scipy,mortonjt/scipy,Eric89GXL/scipy,raoulbq/scipy,mdhaber/scipy,minhlongdo/scipy,ales-erjavec/scipy,jseabold/scipy,argriffing/scipy,mortada/scipy,zaxliu/scipy,Kamp9/scipy,rmcgibbo/scipy,newemailjdm/scipy,Shaswat27/scipy,mortada/scipy,mingwpy/scipy,richardotis/scipy,ogrisel/scipy,matthewalbani/scipy,pbrod/scipy,vanpact/scipy,FRidh/scipy,Shaswat27/scipy,jseabold/scipy,newemailjdm/scipy,aarchiba/scipy,ales-erjavec/scipy,anielsen001/scipy,ortylp/scipy,anielsen001/scipy,ortylp/scipy,sonnyhu/scipy,argriffing/scipy,mtrbean/scipy,Stefan-Endres/scipy,mhogg/scipy,mortada/scipy,FRidh/scipy,ales-erjavec/scipy,zerothi/scipy,vigna/scipy,aeklant/scipy,jonycgn/scipy,chatcannon/scipy,Kamp9/scipy,pbrod/scipy,petebachant/scipy,nmayorov/scipy,perimosocordiae/scipy,andim/scipy,zaxliu/scipy,dch312/scipy,pnedunuri/scipy,jor-/scipy,jor-/scipy,sauliusl/scipy,felipebetancur/scipy,ndchorley/scipy,kleskjr/scipy,lukauskas/scipy,jor-/scipy,jor-/scipy,WillieMaddox/scipy,behzadnouri/scipy,felipebetancur/scipy,rgommers/scipy,Newman101/scipy,mhogg/scipy,Gillu13/scipy,kleskjr/scipy,gertingold/scipy,mhogg/scipy,Newman101/scipy,zxsted/scipy,Stefan-Endres/scipy,surhudm/scipy,WillieMaddox/scipy,vanpact/scipy,sriki18/scipy,efiring/scipy,rgommers/scipy,matthewalbani/scipy,zaxliu/scipy,fredrikw/scipy,jakevdp/scipy,fernand/scipy,pnedunuri/scipy,mtrbean/scipy,piyush0609/scipy,mdhaber/scipy,maciejkula/scipy,woodscn/scipy,Eric89GXL/scipy,nvoron23/scipy,bkendzior/scipy,piyush0609/scipy,lhilt/scipy,hainm/scipy,trankmichael/scipy,Eric89GXL/scipy,mgaitan/scipy,jsilter/scipy,mhogg/scipy,cpaulik/scipy,mingwpy/scipy,gfyoung/scipy,mgaitan/scipy,dominicelse/scipy,bkendzior/scipy,WillieMaddox/scipy,jjhelmus/scipy,Kamp9/scipy,aarchiba/scipy,Newman101/scipy,kleskjr/scipy,bkendzior/scipy,raoulbq/scipy,nonhermitian/scipy,josephcslater/scipy,FRidh/scipy,gertingold/scipy,mdhaber/scipy,maniteja123/scipy,anntzer/scipy,WarrenWeckesser/scipy,WillieMaddox/scipy,hainm/scipy,lukauskas/scipy,e-q/scipy,argriffing/scipy,matthewalbani/scipy,njwilson23/scipy,WillieMaddox/scipy,argriffing/scipy,ndchorley/scipy,jsilter/scipy,mikebenfield/scipy,njwilson23/scipy,maciejkula/scipy,ortylp/scipy,piyush0609/scipy,vigna/scipy,arokem/scipy,mortonjt/scipy,tylerjereddy/scipy,gfyoung/scipy,josephcslater/scipy,fernand/scipy,piyush0609/scipy,ndchorley/scipy,vberaudi/scipy,gdooper/scipy,zerothi/scipy,ndchorley/scipy,ilayn/scipy,mhogg/scipy,Srisai85/scipy,andyfaff/scipy,vigna/scipy,Srisai85/scipy,Stefan-Endres/scipy,Shaswat27/scipy,Newman101/scipy,haudren/scipy,endolith/scipy,fernand/scipy,mingwpy/scipy,jamestwebber/scipy,petebachant/scipy,niknow/scipy,ilayn/scipy,jonycgn/scipy,maniteja123/scipy,vhaasteren/scipy,e-q/scipy,jsilter/scipy,Stefan-Endres/scipy,witcxc/scipy,befelix/scipy,Gillu13/scipy,scipy/scipy,zxsted/scipy,giorgiop/scipy,aman-iitj/scipy,fredrikw/scipy,gef756/scipy,pizzathief/scipy,zaxliu/scipy,fredrikw/scipy,pnedunuri/scipy,dch312/scipy,FRidh/scipy,ilayn/scipy,trankmichael/scipy,dominicelse/scipy,zxsted/scipy,ogrisel/scipy,juliantaylor/scipy,hainm/scipy,andim/scipy,sriki18/scipy,sriki18/scipy,person142/scipy,mtrbean/scipy,maniteja123/scipy,jakevdp/scipy,jjhelmus/scipy,larsmans/scipy,kalvdans/scipy,apbard/scipy,felipebetancur/scipy,kalvdans/scipy,grlee77/scipy,WarrenWeckesser/scipy,pschella/scipy,ilayn/scipy,arokem/scipy,chatcannon/scipy,aarchiba/scipy,newemailjdm/scipy,raoulbq/scipy,lukauskas/scipy,lukauskas/scipy,surhudm/scipy,juliantaylor/scipy,grlee77/scipy,zaxliu/scipy,jamestwebber/scipy,jseabold/scipy,rmcgibbo/scipy,futurulus/scipy,andim/scipy,mortada/scipy,zerothi/scipy,larsmans/scipy,matthew-brett/scipy,lukauskas/scipy,andim/scipy,gef756/scipy,grlee77/scipy,minhlongdo/scipy,kalvdans/scipy,newemailjdm/scipy,chatcannon/scipy,gfyoung/scipy,njwilson23/scipy,njwilson23/scipy,vanpact/scipy,nonhermitian/scipy,ales-erjavec/scipy,josephcslater/scipy,mgaitan/scipy,Kamp9/scipy,kalvdans/scipy,hainm/scipy,jamestwebber/scipy,niknow/scipy,giorgiop/scipy,mikebenfield/scipy,person142/scipy,pschella/scipy,woodscn/scipy,nmayorov/scipy,matthew-brett/scipy,tylerjereddy/scipy,pizzathief/scipy,mdhaber/scipy,woodscn/scipy,fernand/scipy,FRidh/scipy,maniteja123/scipy,aeklant/scipy,anielsen001/scipy,ChanderG/scipy,aeklant/scipy,mdhaber/scipy,anntzer/scipy,matthew-brett/scipy,WarrenWeckesser/scipy,vigna/scipy,maniteja123/scipy,andyfaff/scipy,behzadnouri/scipy,andyfaff/scipy,richardotis/scipy,ilayn/scipy,jjhelmus/scipy,ChanderG/scipy,person142/scipy,zerothi/scipy,e-q/scipy,sauliusl/scipy,mortonjt/scipy,minhlongdo/scipy,Gillu13/scipy,anielsen001/scipy,mortonjt/scipy,Stefan-Endres/scipy,behzadnouri/scipy,matthewalbani/scipy,aman-iitj/scipy,bkendzior/scipy,minhlongdo/scipy,befelix/scipy,njwilson23/scipy,dch312/scipy,arokem/scipy,e-q/scipy,arokem/scipy,mikebenfield/scipy,perimosocordiae/scipy,pschella/scipy,Gillu13/scipy,rmcgibbo/scipy,sonnyhu/scipy,aarchiba/scipy,fernand/scipy,apbard/scipy,anntzer/scipy,mortonjt/scipy,pbrod/scipy,dch312/scipy,pyramania/scipy,ChanderG/scipy,richardotis/scipy,nvoron23/scipy,gef756/scipy,pbrod/scipy,behzadnouri/scipy,ilayn/scipy,WarrenWeckesser/scipy,vhaasteren/scipy,mtrbean/scipy,lukauskas/scipy,mhogg/scipy,minhlongdo/scipy,aman-iitj/scipy,richardotis/scipy,hainm/scipy,trankmichael/scipy,nonhermitian/scipy,fredrikw/scipy,sauliusl/scipy,mgaitan/scipy,nvoron23/scipy,sauliusl/scipy,kleskjr/scipy,efiring/scipy,cpaulik/scipy,Dapid/scipy,tylerjereddy/scipy,nonhermitian/scipy,felipebetancur/scipy,pizzathief/scipy,grlee77/scipy,haudren/scipy,dch312/scipy,kleskjr/scipy,witcxc/scipy,vanpact/scipy,jjhelmus/scipy,dominicelse/scipy,Dapid/scipy,larsmans/scipy,mdhaber/scipy,njwilson23/scipy,sonnyhu/scipy,trankmichael/scipy,jonycgn/scipy,niknow/scipy,kleskjr/scipy,kalvdans/scipy,surhudm/scipy,giorgiop/scipy,mortada/scipy,jakevdp/scipy,vhaasteren/scipy,ogrisel/scipy,behzadnouri/scipy,andyfaff/scipy,endolith/scipy,juliantaylor/scipy,ndchorley/scipy,piyush0609/scipy,nonhermitian/scipy,pnedunuri/scipy,perimosocordiae/scipy,e-q/scipy,mgaitan/scipy,scipy/scipy,rgommers/scipy,jakevdp/scipy,scipy/scipy,aeklant/scipy,piyush0609/scipy,zerothi/scipy,fernand/scipy,jakevdp/scipy,aman-iitj/scipy,matthewalbani/scipy,anielsen001/scipy,person142/scipy,lhilt/scipy,gertingold/scipy,petebachant/scipy,larsmans/scipy,ogrisel/scipy,chatcannon/scipy,vberaudi/scipy,surhudm/scipy,person142/scipy,ogrisel/scipy,josephcslater/scipy,surhudm/scipy,pyramania/scipy,Dapid/scipy,rgommers/scipy,Shaswat27/scipy,efiring/scipy,Srisai85/scipy,pbrod/scipy,pnedunuri/scipy,bkendzior/scipy,raoulbq/scipy,raoulbq/scipy,gdooper/scipy,mingwpy/scipy,mortonjt/scipy,trankmichael/scipy,haudren/scipy,zxsted/scipy,sauliusl/scipy,rmcgibbo/scipy,woodscn/scipy,aeklant/scipy,petebachant/scipy,witcxc/scipy,andim/scipy,pnedunuri/scipy,Stefan-Endres/scipy,woodscn/scipy,richardotis/scipy,Newman101/scipy,gdooper/scipy,tylerjereddy/scipy,sonnyhu/scipy,haudren/scipy,ChanderG/scipy,zxsted/scipy,haudren/scipy,jseabold/scipy,andyfaff/scipy,pizzathief/scipy,endolith/scipy,jamestwebber/scipy,pyramania/scipy,Kamp9/scipy,vberaudi/scipy,juliantaylor/scipy,perimosocordiae/scipy,apbard/scipy,befelix/scipy,futurulus/scipy,pyramania/scipy,zxsted/scipy,vberaudi/scipy,cpaulik/scipy,scipy/scipy,Eric89GXL/scipy,Dapid/scipy,ales-erjavec/scipy,Shaswat27/scipy,vanpact/scipy