fix code example

Author: YqGe585

docs/api/paddle/device/empty_cache_cn.rst

@@ -9,4 +9,10 @@ empty_cache
 
 代码示例
 ::::::::::::
-COPY-FROM: paddle.device.custom_device.empty_cache
+.. code-block:: python
+
+    import paddle
+
+    x = paddle.randn([1000, 1000])
+    del x
+    paddle.device.empty_cache()

docs/api/paddle/device/max_memory_allocated_cn.rst

@@ -19,4 +19,10 @@ max_memory_allocated
 
 代码示例
 ::::::::::::
-COPY-FROM: paddle.device.custom_device.max_memory_allocated
+.. code-block:: python
+
+    >>> import paddle
+    >>> paddle.device.max_memory_allocated('npu:0')
+    >>> paddle.device.max_memory_allocated('npu')
+    >>> paddle.device.max_memory_allocated(0)
+    >>> paddle.device.max_memory_allocated(Paddle.CustomPlace('npu',0))

docs/api/paddle/device/max_memory_reserved_cn.rst

@@ -19,4 +19,10 @@ max_memory_reserved
 
 代码示例
 ::::::::::::
-COPY-FROM: paddle.device.custom_device.max_memory_reserved
+.. code-block:: python
+
+    >>> import paddle
+    >>> paddle.device.max_memory_reserved('npu:0')
+    >>> paddle.device.max_memory_reserved('npu')
+    >>> paddle.device.max_memory_reserved(0)
+    >>> paddle.device.max_memory_reserved(Paddle.CustomPlace('npu',0))

docs/api/paddle/device/memory_allocated_cn.rst

@@ -22,4 +22,10 @@ memory_allocated
 
 代码示例
 ::::::::::::
-COPY-FROM: paddle.device.custom_device.memory_allocated
+.. code-block:: python
+
+    >>> import paddle
+    >>> paddle.device.memory_allocated('npu:0')
+    >>> paddle.device.memory_allocated('npu')
+    >>> paddle.device.memory_allocated(0)
+    >>> paddle.device.memory_allocated(Paddle.CustomPlace('npu',0))

docs/api/paddle/device/memory_reserved_cn.rst

@@ -19,4 +19,10 @@ memory_reserved
 
 代码示例
 ::::::::::::
-COPY-FROM: paddle.device.custom_device.memory_reserved
+.. code-block:: python
+
+    >>> import paddle
+    >>> paddle.device.memory_reserved('npu:0')
+    >>> paddle.device.memory_reserved('npu')
+    >>> paddle.device.memory_reserved(0)
+    >>> paddle.device.memory_reserved(Paddle.CustomPlace('npu',0))

docs/api/paddle/device/reset_max_memory_allocated_cn.rst

@@ -19,4 +19,10 @@ reset_max_memory_allocated
 
 代码示例
 ::::::::::::
-COPY-FROM: paddle.device.custom_device.reset_max_memory_allocated
+.. code-block:: python
+
+    >>> import paddle
+    >>> paddle.device.reset_max_memory_allocated('npu:0')
+    >>> paddle.device.reset_max_memory_allocated('npu')
+    >>> paddle.device.reset_max_memory_allocated(0)
+    >>> paddle.device.reset_max_memory_allocated(Paddle.CustomPlace('npu',0))

docs/api/paddle/device/reset_max_memory_reserved_cn.rst

@@ -19,4 +19,10 @@ reset_max_memory_reserved
 
 代码示例
 ::::::::::::
-COPY-FROM: paddle.device.custom_device.reset_max_memory_reserved
+.. code-block:: python
+
+    >>> import paddle
+    >>> paddle.device.reset_max_memory_reserved('npu:0')
+    >>> paddle.device.reset_max_memory_reserved('npu')
+    >>> paddle.device.reset_max_memory_reserved(0)
+    >>> paddle.device.reset_max_memory_reserved(Paddle.CustomPlace('npu',0))