Merge pull request #6060 from kuke/refine_reshape_op

Amend license and comments in reshape_op

paddle/operators/reshape_op.cc

-
 /* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
 
    Licensed under the Apache License, Version 2.0 (the "License");
@@ -38,8 +37,8 @@ class ReshapeOp : public framework::OperatorWithKernel {
     // TODO(qiao) change batch_size
     for (size_t i = 1; i < shape.size(); ++i) {
       PADDLE_ENFORCE(shape[i] > 0,
-                     "Each dimension of shape "
-                     "must be positiv except the first.");
+                     "Each dimension of Attr(shape) "
+                     "must be positive except the first one.");
     }
     if (shape[0] < 0) {
       shape[0] = x_dims[0];