[Email Security] Update Gmail BCC instructions (#17925)

* [Email Security] Update Gmail BCC instructions

* typo + clarification

Author: Maddy-Cloudflare

src/content/docs/email-security/deployment/api/setup/gsuite-bcc-setup/add-domain.mdx

@@ -16,7 +16,13 @@ To set up Email Security (formerly Area 1) for Gmail:
 1. Log in to the [Email Security (formerly Area 1) dashboard](https://horizon.area1security.com/).
 2. Select the question mark, where you will be able to find your BCC address.
 3. Once you found your address, select **Settings** (the gear icon), then select **New Domain**.
-4. Fill in the information needed to add your domain, then select **Publish Domain**.
+4. Fill in the information needed to add your domain:
+  - **Domain**: Enter the domain you want to set up BCC from Google.
+  - **Configured As**: Select Hops, enter `2`.
+  - **Forwarding To**: Enter `google.com`.
+  - **Outbound TLS**: Select Forward all messages over TLS.
+  - **Quarantine policy**: Ensure no policy is selected.
+5. Select **Publish Domain**.
 
 ## Next steps