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.