Merge pull request #52348 from jeana-redhat/OSDOCS-4413-sts-regional-endpoints

[OSDOCS-4413]: AWS STS uses regional endpoints

Author: jeana-redhat

authentication/managing_cloud_provider_credentials/cco-mode-sts.adoc

@@ -56,6 +56,7 @@ metadata:
 stringData:
   credentials: |-
     [default]
+    sts_regional_endpoints = regional
     role_name: <operator-role-name> <3>
     web_identity_token_file: <path-to-token> <4>
 ----