Writing_Linter_Bears.rst: Improve config_file docs
Writing_Linter_Bears.rst: Improve config_file docs

Straighten out inconsistency in config_file documentation.

Fixes https://github.com/coala/coala/issues/3975

incorrectusername/coala,SanketDG/coala,Nosferatul/coala,kartikeys98/coala,ayushin78/coala,shreyans800755/coala,Asalle/coala,SanketDG/coala,damngamerz/coala,rimacone/testing2,nemaniarjun/coala,karansingh1559/coala,JohnS-01/coala,CruiseDevice/coala,arush0311/coala,jayvdb/coala,kartikeys98/coala,Nosferatul/coala,Nosferatul/coala,CruiseDevice/coala,damngamerz/coala,incorrectusername/coala,arjunsinghy96/coala,coala/coala,coala-analyzer/coala,Balaji2198/coala,netman92/coala,RJ722/coala,rimacone/testing2,kartikeys98/coala,yashLadha/coala,Shade5/coala,CruiseDevice/coala,coala/coala,coala/coala,nemaniarjun/coala,Shade5/coala,Shade5/coala,RJ722/coala,rimacone/testing2,Asnelchristian/coala,aptrishu/coala,RJ722/coala,incorrectusername/coala,karansingh1559/coala,nemaniarjun/coala,yashLadha/coala,shreyans800755/coala,JohnS-01/coala,aptrishu/coala,Balaji2198/coala,JohnS-01/coala,ayushin78/coala,aptrishu/coala,shreyans800755/coala,MariosPanag/coala,netman92/coala,Asalle/coala,ayushin78/coala,Balaji2198/coala,Asnelchristian/coala,Asnelchristian/coala,refeed/coala,refeed/coala,arjunsinghy96/coala,refeed/coala,yashLadha/coala,jayvdb/coala,MariosPanag/coala,Asalle/coala,coala-analyzer/coala,coala-analyzer/coala,netman92/coala,arush0311/coala,MariosPanag/coala,SanketDG/coala,damngamerz/coala,arjunsinghy96/coala,karansingh1559/coala,arush0311/coala,jayvdb/coala