Adding more docs to v2 swagger model.

once and done job, not much fun to be honest ;)

datamodel/high/base/external_doc.go

@@ -9,6 +9,8 @@ import (
 )
 
 // ExternalDoc represents an External Documentation object as defined by OpenAPI 2 and 3
+//
+// Allows referencing an external resource for extended documentation.
 //  v2 - https://swagger.io/specification/v2/#externalDocumentationObject
 //  v3 - https://spec.openapis.org/oas/v3.1.0#external-documentation-object
 type ExternalDoc struct {