Fixed doc regarding dynetcuda
Fixed doc regarding dynetcuda


Former-commit-id: e48d48b697ee6869b1429e7f0f4672995a455d22
clab/dynet,xunzhang/dynet,clab/dynet,clab/cnn,clab/dynet,danielhers/dynet,chunyang-wen/dynet,chunyang-wen/dynet,danielhers/dynet,shuheik/dynet,xunzhang/dynet,danielhers/dynet,shuheik/dynet,danielhers/dynet,clab/dynet,chunyang-wen/dynet,clab/dynet,shuheik/dynet,shuheik/dynet,clab/cnn,clab/dynet,clab/dynet,danielhers/dynet,chunyang-wen/dynet,danielhers/dynet,danielhers/dynet,xunzhang/dynet,shuheik/dynet,clab/cnn,xunzhang/dynet,shuheik/dynet,shuheik/dynet