Overtabed example corrected. (#8633)

Corrected code snippet to be copy paste ready (& properly terminating).

website/pages/docs/secrets/aws/index.mdx

@@ -105,18 +105,17 @@ management tool.
         policy_arns=arn:aws:iam::aws:policy/AmazonEC2ReadOnlyAccess,arn:aws:iam::aws:policy/IAMReadOnlyAccess \
         credential_type=iam_user \
         policy_document=-<<EOF
-            {
-              "Version": "2012-10-17",
-              "Statement": [
-                {
-                  "Effect": "Allow",
-                  "Action": "ec2:*",
-                  "Resource": "*"
-                }
-              ]
-            }
-            EOF
-
+    {
+      "Version": "2012-10-17",
+      "Statement": [
+        {
+          "Effect": "Allow",
+          "Action": "ec2:*",
+          "Resource": "*"
+        }
+      ]
+    }
+    EOF
     ```
 
     For more information on IAM policies, please see the