Fix typo in tutorial-1-xor.ipynb (#946)
Fix typo in tutorial-1-xor.ipynb (#946)



Former-commit-id: e47e9b44809d65a2cf07db343805b2cc258bea5f
danielhers/dynet,shuheik/dynet,xunzhang/dynet,danielhers/dynet,clab/dynet,shuheik/dynet,chunyang-wen/dynet,danielhers/dynet,danielhers/dynet,danielhers/dynet,clab/dynet,danielhers/dynet,shuheik/dynet,chunyang-wen/dynet,xunzhang/dynet,chunyang-wen/dynet,clab/dynet,clab/dynet,shuheik/dynet,xunzhang/dynet,chunyang-wen/dynet,shuheik/dynet,clab/cnn,shuheik/dynet,clab/cnn,danielhers/dynet,xunzhang/dynet,clab/cnn,shuheik/dynet,clab/dynet,clab/dynet,clab/dynet