indicate AWS SDK versions

Author: rachel-mack

source/security/auth/aws-iam.txt

@@ -24,11 +24,13 @@ The ``MONGODB-AWS`` authentication mechanism uses Amazon Web Services
 Identity and Access Management (AWS IAM) credentials to authenticate a user to MongoDB.
 You can use this mechanism only when authenticating to MongoDB Atlas.
 
-.. tip:: Configure Atlas for AWS IAM Authentication
+To learn more about configuring MongoDB Atlas for AWS IAM authentication, see
+:atlas:`Set Up Authentication with AWS IAM </security/aws-iam-authentication/>` in
+the Atlas documentation.
 
-   To learn more about configuring MongoDB Atlas for AWS IAM authentication, see
-   :atlas:`Set Up Authentication with AWS IAM </security/aws-iam-authentication/>` in
-   the Atlas documentation.
+.. note:: AWS SDK
+
+   MongoDB tests using versions 2.30.31 and 1.12.782 of the AWS SDK.
 
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