[ci skip] Remove reference to Rails 4 in the initialization guide.
[ci skip] Remove reference to Rails 4 in the initialization guide.

Following commit removed reference to rails 4, but there is one left.

https://github.com/rails/rails/commit/a9f50f87c38659d0e9425f86f613cf5328d55d27

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