API auto-documentation documentation is missing

[scottinet]

Kuzzle's API is dynamically auto-documented, and that includes API routes added by plugins.

There are multiple ways to access that documentation:

• [all protocols] the server:info route (HTTP URL: http://<server>:<port>/) returns the complete API description
• [HTTP only] swagger descriptions (JSON: http://<server>:<port>/swagger.json, YAML: http://<server>:<port>/swagger.yml)

These informations appear to be missing from our documentation, and it should also be mentionned in our plugin documentation.