add hint on after_action filters
add hint on after_action filters

Adds a hint that ``after_action``-callbacks are not executed when an
exception was raised in the rest of the request cycle. The
``before_action`` section mentions "If there are additional filters
scheduled to run after that filter, they are also cancelled." but this
is IMO not sufficient.

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