Allows referencing an external resource for extended documentation.
https://spec.openapis.org/oas/latest.html#external-documentation-object
Optional
A description of the target documentation. CommonMark syntax MAY be used for rich text representation.
The URL for the target documentation. This MUST be in the form of a URL.
Allows referencing an external resource for extended documentation.
See
https://spec.openapis.org/oas/latest.html#external-documentation-object