enhanced lod_append, lod_reset english doc (#23803)

python/paddle/fluid/layers/nn.py

@@ -6241,9 +6241,11 @@ def lod_reset(x, y=None, target_lod=None):
 
     Args:
         x (Variable): Input variable which could be a Tensor or LoDTensor. 
-        y (Variable|None): If provided, output's LoD would be derived
-                           from :attr:`y`.
-        target_lod (list|tuple|None): One level LoD which should be considered
+                      The data type should be int32, int64, float32 or float64.
+        y (Variable, optional): If provided, output's LoD would be derived from :attr:`y`. 
+                                If y's lod level>0, the data type can be any type. 
+                                If y's lod level=0, the data type should be int32.
+        target_lod (list|tuple, optional): One level LoD which should be considered
                                       as target LoD when :attr:`y` not provided.
 
     Returns:
@@ -6304,8 +6306,10 @@ def lod_append(x, level):
 
     Args:
         x (Variable): Input variable which could be a tensor or LoDTensor. 
-        level (list|tuple|Variable): The LoD level to be appended into LoD of x.
-
+                      The data type should be int32, int64, float32 or float64.
+        level (list|tuple|Variable, optional): The LoD level to be appended into LoD of x. 
+                                               If level is variable and its lod level>0, the data type can be any type.
+                                               If level is variable and its lod level=0, the data type should be int32.
     Returns:
         Variable: Output variable with new LoD level.