Add openapi.json route documentation (#2143)

[faessler]

What does it do?

Adds documentation for new route /documentation/<version>/openapi.json provided by the documentation plugin.

Preview:

Why is it needed?

This is needed to inform devs that there is a way to access the full_documentation.json via endpoint of the documentation plugin.

Related issue(s)/PR(s)

• https://github.com/strapi/strapi/pull/20871
• https://github.com/strapi/documentation/issues/2143
• https://github.com/strapi/documentation/issues/590
• https://github.com/strapi/documentation/issues/366
• https://github.com/strapi/strapi/issues/10734

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Name	Status	Preview	Comments	Updated (UTC)
documentation	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 29, 2024 7:51pm

[strapi-cla]

All committers have signed the CLA.

[pwizla]

HI @faessler!

You'd be happy to learn that your strapi/strapi PR has been merged today into the Strapi v4 codebase. So I'm merging this related docs PR too, but changed the target branch to v4. It will be live on v4 docs in a few minutes. Thank you again for your patience!