Fix comment for norm_op

Author: xuwei06

paddle/operators/norm_op.cc

@@ -39,7 +39,7 @@ class NormOpMaker : public framework::OpProtoAndCheckerMaker {
               "M = C * H * W");
     AddComment(R"DOC(
        "Input shape: $(N, C, H, W)$
-        Sclae shape: $(C, 1)$
+        Scale shape: $(C, 1)$
         Output shape: $(N, C, H, W)$
         Where
         forward

paddle/operators/norm_op.h

@@ -66,7 +66,7 @@ class NormKernel : public framework::OpKernel<T> {
                                  context.GetPlace());
       auto tmp = framework::EigenVector<T, Eigen::RowMajor,
                                         Eigen::DenseIndex>::Flatten(tmp_tensor);
-      // get colsum  and sqrt , inverse
+      // get colsum and sqrt , inverse
       auto dim = Eigen::array<int, 1>({{0}});
       tmp.device(*place) = x_square_batch_eigen.sum(dim);
       tmp.device(*place) = (tmp + epsilon).sqrt().inverse();