Update configuration guide about ActiveRecord's  config option.
Update configuration guide about ActiveRecord's  config option.

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