update URL to core registry REST API docs to latest upstream version (#501)

Author: smccarthy-ie

.build/external-documentation/sr-core-api-reference.quickstart.yml

@@ -14,5 +14,5 @@ spec:
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   description: Learn how to use the Apicurio Registry core REST API to manage the contents of a Service Registry instance.
   link:
-    href: https://www.apicur.io/registry/docs/apicurio-registry/2.1.x/assets-attachments/registry-rest-api.htm
+    href: https://www.apicur.io/registry/docs/apicurio-registry/2.2.x/assets-attachments/registry-rest-api.htm
     text: View documentation