AWS Marketplace offering: recommend m5.xlarge instead of c5.2xlarge (#296)

Author: Paul-Cornell

api-reference/api-services/aws.mdx

@@ -225,7 +225,7 @@ You will establish the foundational network structure for deploying the Unstruct
 
     a.   Enter some unique **Stack name**.
 
-    b.   In the **Parameters** section, in the **InstanceType** drop-down list, select **c5.2xlarge**.
+    b.   In the **Parameters** section, in the **InstanceType** drop-down list, select **m5.xlarge**.
 
     c.   In the **KeyName** drop-down list, select the name of the SSH key pair from the beginning of this article.