fixed typos in assingment 1
fixed typos in assingment 1


Former-commit-id: ffc2d14677f89b25c820035e5eb3df23d087fc7a
Former-commit-id: 6ad5618ba538554873cb63b2d0ff32e033a9e92f
StanfordHCI/cs247,StanfordHCI/cs247,StanfordHCI/cs247