Correct pull requst number in createReduce comment
Correct pull requst number in createReduce comment

I mistyped the pull request number in my previous commit.

documentcloud/underscore,rlugojr/underscore,platinumazure/underscore,platinumazure/underscore,jpalomar/underscore,jdelbello/underscore,jashkenas/underscore,huangnan1/2016gitStudy,jdelbello/underscore,akre54/underscore,tnga/underscore-es,tnga/underscore-es,akre54/underscore,keepgoingwm/underscore,keepgoingwm/underscore,rlugojr/underscore,huangnan1/2016gitStudy,documentcloud/underscore,jpalomar/underscore,jashkenas/underscore