Fix rdoc markup [ci skip]
Fix rdoc markup [ci skip]

Wrapping symbols with + does not work, we must use <tt> instead.

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