Update openapi.md

[walva]

Use openapiContext (object, documentation) instead of openapi (boolean, enabled or not)

Based on what I see here : https://github.com/api-platform/core/blob/3.2/src/Metadata/Post.php

https://api-platform.com/docs/3.2/core/openapi/ @ "Changing Operations in the OpenAPI Documentation"

[walva]

Based on what I see here : https://github.com/api-platform/core/blob/3.2/src/Metadata/Post.php

[vinceAmstoutz]

Thank you so much for your PR and the time you invested in contributing to this project! We truly appreciate your effort and involvement.

Unfortunately, we must close this PR because the codebase has changed significantly since your submission. However, we’d love to see your contributions in the future! If you’re interested, feel free to check out the latest branches (refers to our Maintenance Guide) where your input would be very welcome.