docs: Change regex link to python 3
docs: Change regex link to python 3

Fixes https://github.com/coala-analyzer/coala/issues/1779

yland/coala,swatilodha/coala,netman92/coala,sils1297/coala,impmihai/coala,jayvdb/coala,netman92/coala,scottbelden/coala,impmihai/coala,arjunsinghy96/coala,incorrectusername/coala,karansingh1559/coala,meetmangukiya/coala,refeed/coala,aptrishu/coala,kartikeys98/coala,SanketDG/coala,sils1297/coala,MattAllmendinger/coala,yashLadha/coala,ayushin78/coala,coala-analyzer/coala,Asnelchristian/coala,aptrishu/coala,yashLadha/coala,coala-analyzer/coala,Nosferatul/coala,Balaji2198/coala,tltuan/coala,yland/coala,arjunsinghy96/coala,scottbelden/coala,CruiseDevice/coala,NalinG/coala,netman92/coala,NiklasMM/coala,arjunsinghy96/coala,d6e/coala,AbdealiJK/coala,NalinG/coala,vinc456/coala,ayushin78/coala,NalinG/coala,dagdaggo/coala,sagark123/coala,JohnS-01/coala,NalinG/coala,meetmangukiya/coala,damngamerz/coala,refeed/coala,abhiroyg/coala,rimacone/testing2,svsn2117/coala,scottbelden/coala,jayvdb/coala,arush0311/coala,sophiavanvalkenburg/coala,nemaniarjun/coala,dagdaggo/coala,tltuan/coala,aptrishu/coala,coala/coala,ayushin78/coala,Balaji2198/coala,AbdealiJK/coala,kartikeys98/coala,swatilodha/coala,shreyans800755/coala,SanketDG/coala,mr-karan/coala,sils1297/coala,coala/coala,coala-analyzer/coala,incorrectusername/coala,meetmangukiya/coala,vinc456/coala,tltuan/coala,CruiseDevice/coala,sophiavanvalkenburg/coala,sagark123/coala,svsn2117/coala,NiklasMM/coala,Asalle/coala,Asnelchristian/coala,nemaniarjun/coala,stevemontana1980/coala,shreyans800755/coala,RJ722/coala,NiklasMM/coala,RJ722/coala,rresol/coala,sophiavanvalkenburg/coala,stevemontana1980/coala,MariosPanag/coala,karansingh1559/coala,MattAllmendinger/coala,ManjiriBirajdar/coala,nemaniarjun/coala,djkonro/coala,Shade5/coala,d6e/coala,abhiroyg/coala,jayvdb/coala,damngamerz/coala,Nosferatul/coala,AbdealiJK/coala,NalinG/coala,RJ722/coala,vinc456/coala,mr-karan/coala,NalinG/coala,djkonro/coala,ManjiriBirajdar/coala,tushar-rishav/coala,karansingh1559/coala,Asalle/coala,stevemontana1980/coala,Balaji2198/coala,refeed/coala,yashtrivedi96/coala,damngamerz/coala,SanketDG/coala,JohnS-01/coala,Asnelchristian/coala,Shade5/coala,rimacone/testing2,dagdaggo/coala,rresol/coala,d6e/coala,mr-karan/coala,Shade5/coala,sagark123/coala,shreyans800755/coala,yashLadha/coala,impmihai/coala,NalinG/coala,ManjiriBirajdar/coala,rresol/coala,kartikeys98/coala,coala/coala,MattAllmendinger/coala,swatilodha/coala,svsn2117/coala,MariosPanag/coala,yashtrivedi96/coala,arush0311/coala,tushar-rishav/coala,arush0311/coala,yashtrivedi96/coala,djkonro/coala,Nosferatul/coala,abhiroyg/coala,incorrectusername/coala,CruiseDevice/coala,MariosPanag/coala,Asalle/coala,JohnS-01/coala,tushar-rishav/coala,rimacone/testing2,yland/coala