docs(mge/functional): update functional.zeros_like docstring

imperative/python/megengine/functional/tensor.py

@@ -208,33 +208,20 @@ def zeros(shape, dtype="float32", device=None) -> Tensor:
 
 
 def zeros_like(inp: Union[Tensor, SymbolVar]) -> Union[Tensor, SymbolVar]:
-    r"""Returns a zero tensor with the same shape as input tensor.
+    r"""Returns a tensor filled with zeros with the same shape and data type as input tensor.
 
     Args:
-        inp: input tensor.
+        inp (Tensor): input tensor.
 
     Return:
-        output tensor.
+        a tensor containing zeros.
 
     Examples:
-
-        .. testcode::
-
-            import numpy as np
-            from megengine import tensor
-            import megengine.functional as F
-
-            inp = tensor(np.arange(1, 7, dtype=np.int32).reshape(2,3))
-            out = F.zeros_like(inp)
-            print(out.numpy())
-
-        Outputs:
-
-        .. testoutput::
-
-            [[0 0 0]
-             [0 0 0]]
-
+        >>> input = F.arange(9, dtype='int32').reshape(3,3)
+        >>> F.ones_like(input)
+        Tensor([[0 0 0]
+         [0 0 0]
+         [0 0 0]], dtype=int32, device=xpux:0)
     """
     return full_like(inp, 0.0)