protoc-gen-go-grpc: Update README.md file

[keita127]

I have found these two previous PRs (https://github.com/grpc/grpc-go/pull/4538 https://github.com/grpc/grpc-go/pull/5158) and have also confirmed that the following code actually works.

protoc --go-grpc_out=require_unimplemented_servers=false:. \ foo.proto

However, since go-grpc_out and go-grpc_opt are written separately as the protoc command options on the quick start guide, isn't this easier to understand?

RELEASE NOTES: N/A

[linux-foundation-easycla[bot]]

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[zasweq]

Hello, can you please sign the CLA before we can take a look.

[keita127]

/easycla

[keita127]

Thanks for checking. However, I believe I have already signed the CLA. Please let me know if I am wrong. Also, since tests (tests, 1.20, arm64) have failed, could you please re-run it? I don't think this is caused by my change since I only changed the README.