[Email Security] Update terminal output

Author: Maddy-Cloudflare

src/content/partials/cloudflare-one/email-security/deployment/mx-deployment-prereq.mdx

@@ -14,7 +14,7 @@ To check your existing TTL, open a terminal window and run the following command
 dig mx <YOUR_DOMAIN>
 ```
 
-```sh output
+```txt output
 ; <<>> DiG 9.10.6 <<>> mx <YOUR_DOMAIN>
 ;; global options: +cmd
 ;; Got answer:
@@ -27,9 +27,8 @@ dig mx <YOUR_DOMAIN>
 ;domain.		IN	MX
 
 ;; ANSWER SECTION:
-<YOUR_DOMAIN>.	300	IN	MX	5 mailstream-central.mxrecord.mx.
-<YOUR_DOMAIN>.	300	IN	MX	10 mailstream-east.mxrecord.io.
-<YOUR_DOMAIN>.	300	IN	MX	10 mailstream-west.mxrecord.io.
+domain.    300    IN    MX    10 mxa.global.inbound.cf-emailsecurity.net.
+domain.    300    IN    MX    10 mxb.global.inbound.cf-emailsecurity.net.
 ```
 
 In the above example, TTL is shown in seconds as `300` (or five minutes).