Remove Rack::Lock from the API guides
Remove Rack::Lock from the API guides

It is not always there anymore

[ci skip]

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