Improve readability of contributing to rails guide. [ci skip]
Improve readability of contributing to rails guide. [ci skip]

tjschuck/rails,tjschuck/rails,MichaelSp/rails,Sen-Zhang/rails,odedniv/rails,joonyou/rails,88rabbit/newRails,Spin42/rails,rossta/rails,iainbeeston/rails,kddeisz/rails,coreyward/rails,fabianoleittes/rails,Stellenticket/rails,yahonda/rails,iainbeeston/rails,illacceptanything/illacceptanything,illacceptanything/illacceptanything,printercu/rails,voray/rails,felipecvo/rails,lcreid/rails,repinel/rails,kachick/rails,esparta/rails,kaspth/rails,amoody2108/TechForJustice,illacceptanything/illacceptanything,esparta/rails,MSP-Greg/rails,starknx/rails,stefanmb/rails,yawboakye/rails,arjes/rails,vassilevsky/rails,EmmaB/rails-1,ngpestelos/rails,kmcphillips/rails,MSP-Greg/rails,yahonda/rails,arunagw/rails,Sen-Zhang/rails,eileencodes/rails,xlymian/rails,hanystudy/rails,yhirano55/rails,odedniv/rails,palkan/rails,riseshia/railsguides.kr,hanystudy/rails,alecspopa/rails,illacceptanything/illacceptanything,ttanimichi/rails,esparta/rails,Stellenticket/rails,ttanimichi/rails,schuetzm/rails,illacceptanything/illacceptanything,gavingmiller/rails,travisofthenorth/rails,untidy-hair/rails,gfvcastro/rails,gcourtemanche/rails,ledestin/rails,kenta-s/rails,fabianoleittes/rails,bolek/rails,bradleypriest/rails,gfvcastro/rails,ledestin/rails,kmcphillips/rails,koic/rails,eileencodes/rails,repinel/rails,maicher/rails,yalab/rails,travisofthenorth/rails,notapatch/rails,marklocklear/rails,fabianoleittes/rails,Edouard-chin/rails,palkan/rails,sealocal/rails,kamipo/rails,mechanicles/rails,yasslab/railsguides.jp,matrinox/rails,bogdanvlviv/rails,lcreid/rails,Envek/rails,illacceptanything/illacceptanything,pvalena/rails,yalab/rails,mijoharas/rails,mtsmfm/rails,travisofthenorth/rails,arunagw/rails,yhirano55/rails,kmayer/rails,illacceptanything/illacceptanything,arunagw/rails,mechanicles/rails,Erol/rails,mtsmfm/rails,MSP-Greg/rails,deraru/rails,amoody2108/TechForJustice,rossta/rails,tjschuck/rails,xlymian/rails,matrinox/rails,richseviora/rails,shioyama/rails,maicher/rails,shioyama/rails,untidy-hair/rails,illacceptanything/illacceptanything,betesh/rails,tijwelch/rails,kenta-s/rails,flanger001/rails,voray/rails,mathieujobin/reduced-rails-for-travis,printercu/rails,BlakeWilliams/rails,rails/rails,prathamesh-sonpatki/rails,kachick/rails,fabianoleittes/rails,notapatch/rails,kachick/rails,sergey-alekseev/rails,ngpestelos/rails,samphilipd/rails,Envek/rails,eileencodes/rails,tijwelch/rails,matrinox/rails,betesh/rails,richseviora/rails,BlakeWilliams/rails,kmayer/rails,flanger001/rails,voray/rails,repinel/rails,prathamesh-sonpatki/rails,Vasfed/rails,felipecvo/rails,jeremy/rails,Erol/rails,kirs/rails-1,samphilipd/rails,flanger001/rails,ngpestelos/rails,starknx/rails,sergey-alekseev/rails,gavingmiller/rails,utilum/rails,maicher/rails,rails/rails,starknx/rails,repinel/rails,brchristian/rails,iainbeeston/rails,rbhitchcock/rails,kddeisz/rails,MichaelSp/rails,illacceptanything/illacceptanything,rafaelfranca/omg-rails,sealocal/rails,gcourtemanche/rails,tgxworld/rails,Edouard-chin/rails,aditya-kapoor/rails,MichaelSp/rails,lcreid/rails,betesh/rails,kenta-s/rails,gcourtemanche/rails,marklocklear/rails,lucasmazza/rails,tijwelch/rails,prathamesh-sonpatki/rails,BlakeWilliams/rails,vassilevsky/rails,koic/rails,schuetzm/rails,amoody2108/TechForJustice,aditya-kapoor/rails,vipulnsward/rails,jeremy/rails,pschambacher/rails,shioyama/rails,yawboakye/rails,pvalena/rails,iainbeeston/rails,koic/rails,bogdanvlviv/rails,elfassy/rails,schuetzm/rails,rbhitchcock/rails,mohitnatoo/rails,rafaelfranca/omg-rails,georgeclaghorn/rails,utilum/rails,printercu/rails,baerjam/rails,illacceptanything/illacceptanything,notapatch/rails,Vasfed/rails,88rabbit/newRails,pschambacher/rails,baerjam/rails,yahonda/rails,kddeisz/rails,vipulnsward/rails,arunagw/rails,joonyou/rails,gavingmiller/rails,Stellenticket/rails,rails/rails,assain/rails,88rabbit/newRails,tgxworld/rails,assain/rails,stefanmb/rails,tjschuck/rails,kddeisz/rails,palkan/rails,alecspopa/rails,pvalena/rails,Envek/rails,odedniv/rails,BlakeWilliams/rails,brchristian/rails,gfvcastro/rails,ledestin/rails,notapatch/rails,Vasfed/rails,deraru/rails,gauravtiwari/rails,mathieujobin/reduced-rails-for-travis,mtsmfm/railstest,kamipo/rails,coreyward/rails,untidy-hair/rails,flanger001/rails,hanystudy/rails,schuetzm/rails,georgeclaghorn/rails,bradleypriest/rails,deraru/rails,mijoharas/rails,rbhitchcock/rails,utilum/rails,georgeclaghorn/rails,illacceptanything/illacceptanything,jeremy/rails,illacceptanything/illacceptanything,mechanicles/rails,esparta/rails,tgxworld/rails,Sen-Zhang/rails,mechanicles/rails,kirs/rails-1,ttanimichi/rails,Edouard-chin/rails,untidy-hair/rails,riseshia/railsguides.kr,arjes/rails,elfassy/rails,brchristian/rails,tgxworld/rails,eileencodes/rails,deraru/rails,baerjam/rails,prathamesh-sonpatki/rails,yahonda/rails,gauravtiwari/rails,kamipo/rails,yasslab/railsguides.jp,Spin42/rails,illacceptanything/illacceptanything,aditya-kapoor/rails,baerjam/rails,pvalena/rails,kmcphillips/rails,gauravtiwari/rails,betesh/rails,mtsmfm/rails,printercu/rails,adit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