!9631 fix graph kernel doc problem.

From: @zengzitao
Reviewed-by: @ckey_dou,@gaoxiong1,@ckey_dou
Signed-off-by: @ckey_dou

mindspore/nn/cell.py

@@ -690,6 +690,7 @@ class Cell(Cell_):
             Dict[Parameter, Parameter], returns a dict of original parameter and replaced parameter.
         """
         replace = dict()
+
         def _updata(param):
             if param in replace:
                 return replace[param]
@@ -1078,6 +1079,10 @@ class GraphKernel(Cell):
     A `GraphKernel` a composite of basic primitives and can be compiled into a fused kernel automatically when
     enable_graph_kernel in context is set to True.
 
+    Args:
+        auto_prefix (bool): Recursively generate namespaces. Default: True.
+        flags (dict) : Set graph flags. Default: None.
+
     Examples:
         >>> class Relu(nn.GraphKernel):
         ...    def __init__(self):
@@ -1088,8 +1093,8 @@ class GraphKernel(Cell):
         ...        return self.max(P.Fill()(P.DType()(x), P.Shape()(x), 0.0), x)
     """
 
-    def __init__(self, auto_prefix=True, pips=None):
-        super(GraphKernel, self).__init__(auto_prefix, pips)
+    def __init__(self, auto_prefix=True, flags=None):
+        super(GraphKernel, self).__init__(auto_prefix, flags)
         class_name = self.__class__.__name__
         self.add_flags(graph_kernel=class_name)