Fix paddle.t api docs (#5146)

* fix paddle.t api docs

* fix paddle.t api docs

docs/api/paddle/t_cn.rst

@@ -17,6 +17,33 @@ t
 Tensor，0 维和 1 维 Tensor 返回本身，2 维 Tensor 返回转置 Tensor。
 
 代码示例
-::::::::
+:::::::::
+
+.. code-block:: text
+
+        # 例 1 (0-D tensor)
+        x = tensor([0.79])
+        paddle.t(x) = tensor([0.79])
+
+        # 例 2 (1-D tensor)
+        x = tensor([0.79, 0.84, 0.32])
+        paddle.t(x) = tensor([0.79, 0.84, 0.32])
+
+        # 例 3 (2-D tensor)
+        x = tensor([0.79, 0.84, 0.32],
+                    [0.64, 0.14, 0.57])
+        paddle.t(x) = tensor([0.79, 0.64],
+                            [0.84, 0.14],
+                            [0.32, 0.57])
+
+
+代码示例
+::::::::::::
+
+.. code-block:: python
 
-COPY-FROM: <paddle.t>:<code-example>
+    import paddle
+    x = paddle.ones(shape=[2, 3], dtype='int32')
+    x_transposed = paddle.t(x)
+    print(x_transposed.shape)
+    # [3, 2]