Improve documentation about stubbing route helpers
Improve documentation about stubbing route helpers

* Get rid of an unnecessary newline
* Change 'include Rails' to 'require Rails'
* Clarify when you would need to explicitly include ViewHelpers
* Switch from mocha `stubs` to RSpec `stub`

yui-knk/draper,Bastes/draper,liwangbest/draper,turingschool/draper,estum/draper,donaldpiret/draper,baberthal/draper,outstand/draper,baberthal/draper,jianyuan/draper,chuck-john/draper,jianyuan/draper,drapergem/draper,estum/draper,yui-knk/draper,totzyuta/draper,outstand/draper,drapergem/draper,turingschool/draper,SpencerCDixon/draper,mallikarjunayaddala/draper,chuck-john/draper,sideci-sample/sideci-sample-draper,totzyuta/draper,drapergem/draper,SpencerCDixon/draper,krainboltgreene/draper,mallikarjunayaddala/draper,liwangbest/draper,Bastes/draper