Update index.mdx (#4090)

Author: fpagny

tutorials/how-to-implement-rag-generativeapis/index.mdx

@@ -367,6 +367,7 @@ Below are some known error messages and their corresponding solutions:
 
 
 **Error**: `botocore.exceptions.ClientError: An error occurred (SignatureDoesNotMatch) when calling the ListObjectsV2 operation: The request signature we calculated does not match the signature you provided. Check your key and signing method.`
+
 **Solution**: Ensure that your `SCW_BUCKET_NAME`, `SCW_REGION`, `SCW_BUCKET_ENDPOINT`, and `SCW_SECRET_KEY` are properly configured, the corresponding IAM Principal has the necessary rights, and that your [IAM API key can interact with Object Storage](/identity-and-access-management/iam/api-cli/using-api-key-object-storage/).
 
 **Error**: `urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:992)>`