feat: Add .api syntax, support for multiple routing response docs

[csh995426531]

The current api documentation generated by swagger only has examples of successful returns for returns, and lacks support for multiple return formats, add additional annotation syntax to support the feature.
The final result is similar:

[kesonan]

The current syntax structure can meet your needs, the authors of goctl-swagger will support it in subsequent versions, you can create a feature to the goctl-swagger plugin.

[csh995426531]

The current syntax structure can meet your needs, the authors of goctl-swagger will support it in subsequent versions, you can create a feature to the goctl-swagger plugin.
Okay

[csh995426531]

The current syntax structure can meet your needs, the authors of goctl-swagger will support it in subsequent versions, you can create a feature to the goctl-swagger plugin.

Okay, I added a merge to goctl-swagger to parse the content in the comment, zeromicro/goctl-swagger#55

[waltcow]

😊 it looks good to me

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically. 👯👭🏻🧑‍🤝‍🧑👫🧑🏿‍🤝‍🧑🏻👩🏾‍🤝‍👨🏿👬🏿

---

😊 it looks good to me