docs(obj): update CORS doc MTA-6026 (#4949)

* docs(obj): update CORS doc MTA-6026

* Update pages/object-storage/api-cli/setting-cors-rules.mdx

Co-authored-by: Néda <87707325+nerda-codes@users.noreply.github.com>

---------

Co-authored-by: Néda <87707325+nerda-codes@users.noreply.github.com>

Author: SamyOubouaziz

pages/object-storage/api-cli/setting-cors-rules.mdx

@@ -20,7 +20,7 @@ The [CORS standard](https://en.wikipedia.org/wiki/Cross-origin_resource_sharing)
 
 - A Scaleway account logged into the [console](https://console.scaleway.com)
 - [Owner](/iam/concepts/#owner) status or [IAM permissions](/iam/concepts/#permission) allowing you to perform actions in the intended Organization
-- Installed the [AWS CLI](/object-storage/api-cli/object-storage-aws-cli/)
+- Installed and configured the [AWS CLI](/object-storage/api-cli/object-storage-aws-cli/) using a Scaleway API key
 - An [Object Storage bucket](/object-storage/how-to/create-a-bucket/)
 
 ## CORS overview
@@ -113,3 +113,9 @@ aws s3api delete-bucket-cors --bucket BUCKETNAME
 ```
 
     If the operation is successful, no output is returned.
+
+## Troubleshooting
+
+If you encounter errors while using CORS rules with Scaleway Object Storage, make sure you have properly configured the [AWS CLI](/object-storage/api-cli/object-storage-aws-cli/) using your Scaleway credentials.
+
+Refer to the [dedicated troubleshooting pages](/object-storage/troubleshooting/) to get more help with Scaleway Object Storage.