Update ReadMe.md

tensorflow2fluid/doc/ReadMe.md

@@ -12,7 +12,7 @@
 | 6    | [tf.assign_add](https://www.tensorflow.org/api_docs/python/tf/assign_add) | [fluid.layers.increment](http://paddlepaddle.org/documentation/docs/zh/1.3/api_cn/layers_cn.html#increment) | 功能一致                                                     |
 | 7    | [tf.case](https://www.tensorflow.org/api_docs/python/tf/case) | [fluid.layers.Switch](http://paddlepaddle.org/documentation/docs/zh/1.3/api_cn/layers_cn.html#Switch) | [差异对比](https://github.com/PaddlePaddle/X2Paddle/blob/master/tensorflow2fluid/doc/tf.case.md) |
 | 8    | [tf.cast](https://www.tensorflow.org/api_docs/python/tf/cast) | [fluid.layers.cast](http://paddlepaddle.org/documentation/docs/zh/1.3/api_cn/layers_cn.html#cast) | 功能一致                                                     |
-| 9    | [tf.clip_by_global_norm](https://www.tensorflow.org/api_docs/python/tf/clip_by_global_norm) | [fluid.clip.GradientClipByGlobalNorm](http://paddlepaddle.org/documentation/docs/zh/1.3/api_cn/clip_cn.html#gradientclipbyglobalnorm) | 功能一致                                                     |
+| 9    | [tf.clip_by_global_norm](https://www.tensorflow.org/api_docs/python/tf/clip_by_global_norm) | [fluid.clip.GradientClipByGlobalNorm](http://paddlepaddle.org/documentation/docs/zh/1.3/api_cn/clip_cn.html#gradientclipbyglobalnorm) | [差异对比](https://github.com/PaddlePaddle/X2Paddle/blob/master/tensorflow2fluid/doc/tf.clip_by_global_norm.md)                                                     |
 | 10   | [tf.clip_by_norm](https://www.tensorflow.org/api_docs/python/tf/clip_by_norm) | [fluid.layers.clip_by_norm](http://www.paddlepaddle.org/documentation/docs/zh/1.3/api_cn/layers_cn.html#paddle.fluid.layers.clip_by_norm) | 功能一致                                                     |
 | 11   | [tf.clip_by_value](https://www.tensorflow.org/api_docs/python/tf/clip_by_value) | [fluid.layers.clip](http://paddlepaddle.org/documentation/docs/zh/1.3/api_cn/layers_cn.html#clip) | 功能一致                                                     |
 | 12   | [tf.concat](https://www.tensorflow.org/api_docs/python/tf/concat) | [fluid.layers.concat](http://paddlepaddle.org/documentation/docs/zh/1.3/api_cn/layers_cn.html#paddle.fluid.layers.concat) | 功能一致                                                     |