BUG: fix issue in scipy.special tutorial example.  Closes gh-3784.
BUG: fix issue in scipy.special tutorial example.  Closes gh-3784.

Thanks to @CraigVD for reporting and suggestion a fix.

[ci skip]

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