Writing_Tests: Remove section on assert methods
Writing_Tests: Remove section on assert methods

It is better to link to the python unittest module's documentation
and not repeat the same info here.

Related to https://github.com/coala-analyzer/coala/issues/1931

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