文档修复 (#51419)

* update rnn.py

* update common.py

* update rnn.py

* update common.py

* fix CI

python/paddle/nn/functional/common.py

@@ -1996,7 +1996,7 @@ def class_center_sample(label, num_classes, num_samples, group=None):
     For more information, Partial FC: Training 10 Million Identities on a Single Machine
     arxiv: https://arxiv.org/abs/2010.05222
 
-    .. hint::
+    Note:
         If the number of the positive class centers is greater than the input num_samples, it keeps all the positive
         class centers and the shape of sampled_class_center will be [num_positive_class_centers].
 

python/paddle/nn/layer/rnn.py

@@ -1164,7 +1164,7 @@ class RNN(Layer):
         - **final_states** (Tensor|list|tuple): final states of the cell. Tensor or a possibly nested structure of tensors which has the same structure with intial state. Each tensor in final states has the same shape and dtype as the corresponding tensor in initial states.
 
     Notes:
-        This class is a low level API for wrapping rnn cell into a RNN network.
+        This class is a low-level API for wrapping rnn cell into a RNN network.
         Users should take care of the state of the cell. If `initial_states` is
         passed to the `forward` method, make sure that it satisfies the
         requirements of the cell.