remove reference to `register_javascript_expansion` and `register_stylesheet_expansion` from guide [ci skip]
remove reference to `register_javascript_expansion` and `register_stylesheet_expansion` from guide [ci skip]

These methods no longer exists.

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