/_openapi?scope=app is invalid as Openapi 3.0.0

[psam44]

Version 2.22.0

‌Pasted /_openapi?scope=app to editor.swagger.io‌

schemes was swagger 2.0.
discord is invalid property name. You may consider to set it as an extension, named with a x- prefix.
default has to be a string type.

Additional remark: instead of hardcoded values localhost and 7512, it would be better to put the effective values of the server (but in case of reverse-proxy, I'm not sure it is reliable).