update readme, add prepare for sever env

funasr/runtime/python/grpc/Readme.md

@@ -7,13 +7,13 @@ The audio data is in streaming, the asr inference process is in offline.
 
 Step 1) Prepare server environment.
 ```
-#Modelscope cuda docker is preferred.
+#Optional, modelscope cuda docker is preferred.
 docker run --network host -d -it --gpus '"device=0"' -v /data:/data registry.cn-hangzhou.aliyuncs.com/modelscope-repo/modelscope:ubuntu20.04-cuda11.3.0-py37-torch1.11.0-tf1.15.5-1.2.0
 ```
 
 Step 2) Generate protobuf file for server and client.
 ```
-#(Optional, paraformer_pb2.py and paraformer_pb2_grpc.py are already generated.)
+#Optional, paraformer_pb2.py and paraformer_pb2_grpc.py are already generated.
 python -m grpc_tools.protoc  --proto_path=./proto -I ./proto    --python_out=. --grpc_python_out=./ ./proto/paraformer.proto
 ```