Update BERT_10_MINS_CN.md

doc/BERT_10_MINS_CN.md

@@ -12,17 +12,14 @@ Paddle Serving支持基于Paddle进行训练的各种模型，并通过指定模
 import paddlehub as hub
 model_name = "bert_chinese_L-12_H-768_A-12"
 module = hub.Module(model_name)
-inputs, outputs, program = module.context(
-    trainable=True, max_seq_len=20)
-feed_keys = ["input_ids", "position_ids", "segment_ids",
-             "input_mask", "pooled_output", "sequence_output"]
+inputs, outputs, program = module.context(trainable=True, max_seq_len=20)
+feed_keys = ["input_ids", "position_ids", "segment_ids", "input_mask", "pooled_output", "sequence_output"]
 fetch_keys = ["pooled_output", "sequence_output"]
 feed_dict = dict(zip(feed_keys, [inputs[x] for x in feed_keys]))
 fetch_dict = dict(zip(fetch_keys, [outputs[x]] for x in fetch_keys))
 
 import paddle_serving_client.io as serving_io
-serving_io.save_model("bert_seq20_model", "bert_seq20_client",
-                      feed_dict, fetch_dict, program)
+serving_io.save_model("bert_seq20_model", "bert_seq20_client", feed_dict, fetch_dict, program)
 ```
 
 #### Step2：启动服务