Update README

net/grpc/gateway/examples/helloworld/README.md

@@ -222,16 +222,17 @@ And that's it! We have all the code ready. Let's run the example!
 ## Generate Protobuf Messages and Client Service Stub
 
 To generate the protobuf messages and client service stub class from your
-`.proto` definitions, we need the `protoc` binary and the
-`protoc-gen-grpc-web` plugin.
+`.proto` definitions, we need:
+ - The `protoc` binary, and
+ - The `protoc-gen-grpc-web` plugin.
 
-You can download the `protoc-gen-grpc-web` protoc plugin from our
-[release](https://github.com/grpc/grpc-web/releases) page:
+> You can download the `protoc-gen-grpc-web` protoc plugin from our
+> [release](https://github.com/grpc/grpc-web/releases) page:
 
-If you don't already have `protoc` installed, you will have to download it
-first from [here](https://github.com/protocolbuffers/protobuf/releases).
+> If you don't already have `protoc` installed, you will have to download it
+> first from [here](https://github.com/protocolbuffers/protobuf/releases).
 
-Make sure they are both executable and are discoverable from your PATH.
+> Make sure they are both executable and are discoverable from your PATH.
 
 When you have both `protoc` and `protoc-gen-grpc-web` installed, you can now
 run this command: