Added warning about OpenAPI definitions

[Realmbird]

Closes #8474

Add warning about OpenAPI definitions that swagger only includes subset of api and people should view developer's docs for the full set.

Technical

Adds more to open library swagger docs page adding disclaimer that it is not all of the docs.

Testing

1. docker compose up
   2. http://localhost:8080/
2. Go to add swagger/docs#/ to url or http://localhost:8080/swagger/docs#/
3. View changed swagger docs page

Screenshot

Before

After

Stakeholders

@RayBB

[RayBB]

That's just what we want. Nice job 👍
Now we just need staff to merge it.