Fix doc formatting for `count_by_sql`
Fix doc formatting for `count_by_sql`

Before:

![before](https://cloud.githubusercontent.com/assets/10076/5592809/25ce08e8-9199-11e4-9dfe-5baa8bd6b658.png)

After:

![after](https://cloud.githubusercontent.com/assets/10076/5592810/25ceef9c-9199-11e4-88f4-d286203d7f6f.png)

[ci skip]

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