message: Improve check availability API endpoint documentation
diff: @@ -2394,9 +2394,9 @@ paths:
  description: Value to check
  responses:
  "204":
  - description: "Found, the value is not available"
  + description: "Found, the value exists, and is not free to use"
  "404":
  - description: "Not found, the value is available"
  + description: "Not found, the value does not exist, and is free to use"
  "429":
  $ref: "#/components/responses/TooManyRequests"
  "500":
  