Update guide text not to contradict image
Update guide text not to contradict image

The bottom line in the image of `ActionController::UnknownFormat`is not
truncated. Now the text does not say it is.

[ci skip]

lcreid/rails,gauravtiwari/rails,pvalena/rails,yhirano55/rails,esparta/rails,mohitnatoo/rails,tgxworld/rails,palkan/rails,georgeclaghorn/rails,travisofthenorth/rails,tjschuck/rails,yawboakye/rails,kddeisz/rails,printercu/rails,bogdanvlviv/rails,eileencodes/rails,joonyou/rails,starknx/rails,notapatch/rails,jeremy/rails,schuetzm/rails,betesh/rails,esparta/rails,odedniv/rails,fabianoleittes/rails,vipulnsward/rails,deraru/rails,illacceptanything/illacceptanything,Edouard-chin/rails,deraru/rails,kddeisz/rails,vipulnsward/rails,illacceptanything/illacceptanything,lcreid/rails,Edouard-chin/rails,lcreid/rails,esparta/rails,Erol/rails,starknx/rails,arunagw/rails,untidy-hair/rails,gfvcastro/rails,yhirano55/rails,shioyama/rails,odedniv/rails,Erol/rails,mohitnatoo/rails,yalab/rails,flanger001/rails,assain/rails,gfvcastro/rails,mechanicles/rails,mohitnatoo/rails,illacceptanything/illacceptanything,tjschuck/rails,iainbeeston/rails,kmcphillips/rails,illacceptanything/illacceptanything,printercu/rails,Vasfed/rails,illacceptanything/illacceptanything,EmmaB/rails-1,Envek/rails,notapatch/rails,georgeclaghorn/rails,repinel/rails,Envek/rails,printercu/rails,MSP-Greg/rails,schuetzm/rails,iainbeeston/rails,rails/rails,arunagw/rails,jeremy/rails,kddeisz/rails,fabianoleittes/rails,betesh/rails,rails/rails,illacceptanything/illacceptanything,joonyou/rails,palkan/rails,assain/rails,illacceptanything/illacceptanything,printercu/rails,aditya-kapoor/rails,travisofthenorth/rails,rafaelfranca/omg-rails,kmcphillips/rails,starknx/rails,rails/rails,prathamesh-sonpatki/rails,esparta/rails,palkan/rails,georgeclaghorn/rails,MSP-Greg/rails,yalab/rails,mohitnatoo/rails,tjschuck/rails,schuetzm/rails,notapatch/rails,vipulnsward/rails,mechanicles/rails,EmmaB/rails-1,gfvcastro/rails,arunagw/rails,shioyama/rails,rafaelfranca/omg-rails,Edouard-chin/rails,Edouard-chin/rails,pvalena/rails,lcreid/rails,yalab/rails,baerjam/rails,illacceptanything/illacceptanything,georgeclaghorn/rails,gauravtiwari/rails,odedniv/rails,yahonda/rails,aditya-kapoor/rails,yhirano55/rails,notapatch/rails,baerjam/rails,gfvcastro/rails,eileencodes/rails,tjschuck/rails,Vasfed/rails,gauravtiwari/rails,Erol/rails,jeremy/rails,utilum/rails,tgxworld/rails,mechanicles/rails,yahonda/rails,Erol/rails,illacceptanything/illacceptanything,eileencodes/rails,arunagw/rails,Envek/rails,flanger001/rails,flanger001/rails,BlakeWilliams/rails,shioyama/rails,Vasfed/rails,untidy-hair/rails,Stellenticket/rails,aditya-kapoor/rails,BlakeWilliams/rails,BlakeWilliams/rails,repinel/rails,travisofthenorth/rails,yhirano55/rails,mechanicles/rails,fabianoleittes/rails,bogdanvlviv/rails,yalab/rails,yahonda/rails,betesh/rails,illacceptanything/illacceptanything,iainbeeston/rails,Vasfed/rails,MSP-Greg/rails,Stellenticket/rails,illacceptanything/illacceptanything,bogdanvlviv/rails,pvalena/rails,rails/rails,kmcphillips/rails,BlakeWilliams/rails,flanger001/rails,shioyama/rails,prathamesh-sonpatki/rails,MSP-Greg/rails,betesh/rails,baerjam/rails,iainbeeston/rails,untidy-hair/rails,prathamesh-sonpatki/rails,utilum/rails,pvalena/rails,tgxworld/rails,aditya-kapoor/rails,bogdanvlviv/rails,illacceptanything/illacceptanything,vipulnsward/rails,deraru/rails,illacceptanything/illacceptanything,kddeisz/rails,yawboakye/rails,yawboakye/rails,repinel/rails,prathamesh-sonpatki/rails,yawboakye/rails,jeremy/rails,kmcphillips/rails,eileencodes/rails,deraru/rails,yahonda/rails,joonyou/rails,illacceptanything/illacceptanything,travisofthenorth/rails,rafaelfranca/omg-rails,joonyou/rails,repinel/rails,untidy-hair/rails,Stellenticket/rails,Stellenticket/rails,utilum/rails,EmmaB/rails-1,assain/rails,tgxworld/rails,baerjam/rails,palkan/rails,schuetzm/rails,utilum/rails,assain/rails,Envek/rails,illacceptanything/illacceptanything,fabianoleittes/rails