Use placeholder for account id.

Author: dkocher

tutorials/s3_iam_role_mfa.md

@@ -25,8 +25,8 @@ Configure a user in AWS IAM that is required to use MFA to connect to S3
     ```
     [<S3-ROLE-NAME>]
     source_profile=<S3_USER>
-    role_arn=arn:aws:iam::930717317329:role/<S3-ROLE-NAME>
-    mfa_serial=arn:aws:iam::930717317329:mfa/<MFA-DEVICE-NAME>
+    role_arn=arn:aws:iam::<Account ID>:role/<S3-ROLE-NAME>
+    mfa_serial=arn:aws:iam::<Account ID>:mfa/<MFA-DEVICE-NAME>
     ```
 
 ### Create IAM role allowing access to S3 enforcing the MFA requirement
@@ -55,8 +55,8 @@ Configure a user in AWS IAM that is required to use MFA to connect to S3
     ```
     [<S3-ROLE-NAME>]
     source_profile=<S3_USER>
-    role_arn=arn:aws:iam::930717317329:role/<S3-ROLE-NAME>
-    mfa_serial=arn:aws:iam::930717317329:mfa/<MFA-DEVICE-NAME>
+    role_arn=arn:aws:iam::<Account ID>:role/<S3-ROLE-NAME>
+    mfa_serial=arn:aws:iam::<Account ID>:mfa/<MFA-DEVICE-NAME>
     ```
     This will require the user to enter a MFA code when assuming a role with a S3 access policy attached when connecting.
 
@@ -91,7 +91,7 @@ Configure a user in AWS IAM that is required to use MFA to connect to S3
        {
           "Effect": "Allow",
           "Action": "sts:AssumeRole",
-          "Resource": "arn:aws:iam::ACCOUNT_ID:role/S3-ROLE-NAME"
+          "Resource": "arn:aws:iam::<Account ID>:role/S3-ROLE-NAME"
         }
         ]
     }