Fix doc (adadelta, sgd, momentum) (#29212)

* fix 3 doc

* fix 3 doc

* Update adadelta.py

python/paddle/fluid/tests/unittests/CMakeLists.txt

@@ -379,7 +379,6 @@ list(REMOVE_ITEM TEST_OPS test_imperative_static_runner_while)
 
 # disable this unittest temporarily
 list(REMOVE_ITEM TEST_OPS test_imperative_data_loader_exception)
-list(REMOVE_ITEM TEST_OPS test_sampling_id_op)
 
 if (APPLE OR WIN32)
   list(REMOVE_ITEM TEST_OPS test_dataset)

python/paddle/optimizer/adadelta.py

@@ -62,9 +62,9 @@ class Adadelta(Optimizer):
 
     Examples:
         .. code-block:: python
+	
             import paddle
             import numpy as np
-            paddle.disable_static()
             inp = np.random.uniform(-0.1, 0.1, [10, 10]).astype("float32")
             linear = paddle.nn.Linear(10, 10)
             inp = paddle.to_tensor(inp)

python/paddle/optimizer/momentum.py

@@ -71,7 +71,6 @@ class Momentum(Optimizer):
 
             import paddle
             import numpy as np
-            paddle.disable_static()
             inp = np.random.uniform(-0.1, 0.1, [10, 10]).astype("float32")
             linear = paddle.nn.Linear(10, 10)
             inp = paddle.to_tensor(inp)

python/paddle/optimizer/sgd.py

@@ -54,7 +54,6 @@ class SGD(Optimizer):
 
             import paddle
             import numpy as np
-            paddle.disable_static()
             inp = np.random.uniform(-0.1, 0.1, [10, 10]).astype("float32")
             linear = paddle.nn.Linear(10, 10)
             inp = paddle.to_tensor(inp)