[doc] Change docs of WeightNormParamAttr to dygraph model (#27571)
[doc] Change docs of WeightNormParamAttr to dygraph model (#27571)

* Change docs of WeightNormParamAttr to dygraph model, test=develop, test=document_fix
PaddlePaddle/Paddle,PaddlePaddle/Paddle,PaddlePaddle/Paddle,PaddlePaddle/Paddle,luotao1/Paddle,luotao1/Paddle,luotao1/Paddle,luotao1/Paddle,PaddlePaddle/Paddle,luotao1/Paddle,luotao1/Paddle,luotao1/Paddle,PaddlePaddle/Paddle,PaddlePaddle/Paddle