Refine docs of Protobuf emitter and OpenAPI3 emitter

The name of protobuf emitter is not precise. [Guide | TypeSpec](https://typespec.io/docs/emitters/protobuf/guide/#fundamental-concepts); 
![Image](https://github.com/user-attachments/assets/81a7d375-daec-4e35-8155-cb3b5ccccadf)

It should declare that typespec/openapi3 emitter support for both 3.0 and 3.1 [Overview | TypeSpec](https://typespec.io/docs/emitters/openapi3/reference/).

![Image](https://github.com/user-attachments/assets/74aa2fe3-de11-4bfa-8755-2038539c5cc3)

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Refine docs of Protobuf emitter and OpenAPI3 emitter #7539

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Refine docs of Protobuf emitter and OpenAPI3 emitter #7539

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