python save/load tutorial, small fix
python save/load tutorial, small fix


Former-commit-id: b1ab12a9a2f730eb149d838be8972514975a0867
xunzhang/dynet,danielhers/dynet,chunyang-wen/dynet,clab/dynet,clab/dynet,xunzhang/dynet,danielhers/dynet,shuheik/dynet,danielhers/dynet,clab/cnn,clab/dynet,shuheik/dynet,chunyang-wen/dynet,clab/cnn,clab/dynet,shuheik/dynet,xunzhang/dynet,shuheik/dynet,shuheik/dynet,chunyang-wen/dynet,shuheik/dynet,clab/dynet,danielhers/dynet,shuheik/dynet,danielhers/dynet,chunyang-wen/dynet,xunzhang/dynet,clab/dynet,danielhers/dynet,clab/dynet,danielhers/dynet,clab/cnn