remove warning

Author: jordan-smith721

source/security/authentication/aws-iam.txt

@@ -116,12 +116,6 @@ The driver checks for your credentials in the following sources in order:
       ``us-east-1``. For a list of available AWS regions, see the
       `Regional Endpoints <https://docs.aws.amazon.com/general/latest/gr/rande.html#regional-endpoints>`__ 
       section of the AWS Service Endpoints reference in the AWS documentation. 
-
-      .. warning:: Consult your SDK's Documentation for Setting an AWS Region
-
-         You cannot set your AWS region with environment variables for all SDKs,
-         as in the above example. See your SDK's specific documentation for 
-         configuring an AWS region. 
 
       After you've set the preceding environment variables, specify the ``MONGODB-AWS``
       authentication mechanism in your connection string as shown in the following example: