remove deprecated `Module#qualified_const_` from guide [ci skip]
remove deprecated `Module#qualified_const_` from guide [ci skip]

Follow up to #17845.

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