Fixed typo on section 6 solutions
Fixed typo on section 6 solutions

tofergregg/cs106X-website-winter-2017,tofergregg/cs106X-website-winter-2017,tofergregg/cs106X-website-winter-2017,tofergregg/cs106X-website-winter-2017,tofergregg/cs106X-website-winter-2017