!453 fix doc/comments issues

Merge pull request !453 from 万万没想到/I1CEDO

mindspore/ops/__init__.py

@@ -26,6 +26,8 @@ Note:
     - The Primitive operators in operations need to be used after instantiation.
     - The composite operators are pre-defined combination of operator.
     - The functional operators are the pre-instantiated Primitive operators, which can be used directly like a function.
+    - For functional operators usage, please refer to
+      https://gitee.com/mindspore/mindspore/blob/master/mindspore/ops/functional.py
 """
 
 from .primitive import Primitive, PrimitiveWithInfer, prim_attr_register

mindspore/ops/operations/array_ops.py

@@ -795,7 +795,7 @@ class ZerosLike(PrimitiveWithInfer):
 
     Examples:
         >>> zeroslike = P.ZerosLike()
-        >>> x = Tensor(np.array([[0, 1], [2, 1]]).astype(np.int32))
+        >>> x = Tensor(np.array([[0, 1], [2, 1]]).astype(np.float32))
         >>> output = zeroslike(x)
     """