DOCSP-32565: Fix the AWS refresh credentials example (#430)

(cherry picked from commit 5918da9)

Author: Chris Cho

source/fundamentals/auth.txt

@@ -369,7 +369,12 @@ or using `Elastic Kubernetes Service <https://docs.aws.amazon.com/eks/latest/use
    :dedent:
    :start-after: start refreshCredentials
    :end-before: end refreshCredentials
-   :emphasize-lines: 4-5, 9
+   :emphasize-lines: 4-5,8-9
+
+.. note::
+
+   If you must provide AWS IAM credentials in a connection string, refer to
+   a previous release of the `MONGODB-AWS driver documentation <https://www.mongodb.com/docs/drivers/java/sync/v4.7/fundamentals/auth/#mongodb-aws>`__.
 
 .. _x509-auth-mechanism: