[MS][OPS] code docs fix standard_normal ops parameter

docs/api/api_python/ops/mindspore.ops.func_standard_normal.rst

@@ -11,7 +11,7 @@ mindspore.ops.standard_normal
         f(x)=\frac{1}{\sqrt{2 \pi}} e^{\left(-\frac{x^{2}}{2}\right)}
 
     参数：
-        - **shape** (tuple) - 目标随机数Tensor的shape。只允许常量值。
+        - **shape** (Union[tuple, Tensor]) - 待生成的Tensor的shape。当为tuple类型时，只支持常量值；当为Tensor类型时，支持动态Shape。
         - **seed** (int) - 随机种子，非负值。默认值：0。
         - **seed2** (int) - 随机种子2，用来防止随机种子冲突，非负值。默认值：0。
 
@@ -20,5 +20,6 @@ mindspore.ops.standard_normal
 
     异常：
         - **TypeError** - `seed` 或 `seed2` 不是int类型。
-        - **TypeError** - `shape` 不是Tuple。
-        - **ValueError** - `shape` 不是常量值。
+        - **TypeError** - `shape` 既不是tuple，也不是Tensor。
+        - **ValueError** - `seed` 或 `seed2` 不是非负的int。
+        - **ValueError** - `shape` 为tuple时，包含非正的元素。

mindspore/python/mindspore/ops/function/random_func.py

@@ -249,17 +249,19 @@ def standard_normal(shape, seed=0, seed2=0):
         f(x)=\frac{1}{\sqrt{2 \pi}} e^{\left(-\frac{x^{2}}{2}\right)}
 
     Args:
-        shape (tuple): The shape of random tensor to be generated. Only constant value is allowed.
+        shape (Union[tuple, Tensor]): The shape of random tensor to be generated. Only constant value is allowed
+          when the input type is tuple. And the operator supports dynamic shape only when the input type is Tensor.
         seed (int): Random seed, must be non-negative. Default: 0.
         seed2 (int): Random seed2, must be non-negative. A second seed to avoid seed collision. Default: 0.
 
     Returns:
-        Tensor. The shape is the same as the input `shape`. The dtype is float32.
+        Tensor. The shape that the input 'shape' denotes. The dtype is float32.
 
     Raises:
         TypeError: If `seed` or `seed2` is not an int.
-        TypeError: If `shape` is not a tuple.
-        ValueError: If `shape` is not a constant value.
+        TypeError: If `shape` is neither a tuple nor a Tensor.
+        ValueError: If `seed` or `seed2` is not a non-negative int.
+        ValueError: If `shape` is a tuple containing non-positive items.
 
     Supported Platforms:
         ``Ascend`` ``GPU`` ``CPU``