delate some wrong message test=develop, test=document_fix (#26596)

* delate some wrong message test=develop, test=document_fix

* delate some wrong message

python/paddle/fluid/layers/nn.py

@@ -11811,8 +11811,7 @@ def slice(input, axes, starts, ends):
                 result = [ [2, 3, 4], ] # result = data[0:1, 1:4]
     Args:
         input (Variable): A ``Tensor`` or ``LoDTensor`` . The data type is ``float16``, ``float32``, ``float64``, ``int32`` or ``int64``.
-        axes (list|tuple): The data type is ``int32`` . Axes that `starts` and `ends` apply to.
-                            It's optional. If it is not provides, it will be treated as :math:`[0,1,...,len(starts)-1]`.
+        axes (list|tuple): The data type is ``int32`` . Axes that `starts` and `ends` apply to .
         starts (list|tuple|Variable): The data type is ``int32`` . If ``starts`` is a list or tuple, the elements of
                 it should be integers or Tensors with shape [1]. If ``starts`` is an Variable, it should be an 1-D Tensor.
                 It represents starting indices of corresponding axis in ``axes``.