DOC: stats: complete the 'create a new distribution' examples
DOC: stats: complete the 'create a new distribution' examples

... in the docstrings of rv_discrete and rv_continuous.

Also add discussion of the shapes inspection magic to the Parameters section.

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