Fix: OAI#2471. Clarify status code text. (OAI#2630)

* Fix: OAI#2471. Clarify status code text.

* Update versions/3.1.1.md

Co-authored-by: Darrel <[email protected]>

Co-authored-by: Darrel <[email protected]>

Author: 2 people

versions/3.1.1.md

@@ -97,7 +97,7 @@ Some examples of possible media type definitions:
 ```
 ##### <a name="httpCodes"></a>HTTP Status Codes
 The HTTP Status Codes are used to indicate the status of the executed operation. 
-The available status codes are defined by [RFC7231](https://tools.ietf.org/html/rfc7231#section-6) and registered status codes are listed in the [IANA Status Code Registry](https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml).
+Status codes SHOULD be selected from the available status codes registered in the [IANA Status Code Registry](https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml).
 
 ## Specification