DOC: fix incorrect equation in spatial.distance.mahalanobis docstring.
DOC: fix incorrect equation in spatial.distance.mahalanobis docstring.

This closes ticket 1664.  Thanks to dougal for the patch.

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