Update docs/3-controllers.md
Update docs/3-controllers.md

line 92: changed "before-filter" to "after-filter"

TimothyGu/ejs-tj,tyduptyler13/ejs,zensh/ejs,mmis1000/ejs-promise,operatino/ejs,insidewarehouse/ejs,xanxiver/ejs,TimothyGu/ejs-tj,mde/ejs,rpaterson/ejs,cnwhy/ejs,jtsay362/solveforall-ejs2,insidewarehouse/ejs,cnwhy/ejs,kolonse/ejs,kolonse/ejs,zensh/ejs