Update opening language of allowlisting docs. (#15205)

Co-authored-by: Jeff Hale <[email protected]>

docs/3.0/manage/cloud/manage-users/secure-access-by-ip-address.mdx

@@ -3,10 +3,11 @@ title: Secure access by IP address
 description: Manage network access to Prefect Cloud accounts with IP Allowlists.
 ---
 
-Prefect Cloud's [Enterprise plan](https://www.prefect.io/pricing) offers IP allowlisting to restrict access to
-Prefect Cloud APIs and UI at the network level by giving users the ability to manage an explicit list of allowed IP addresses for an account.
+IP allowlisting is an available upgrade to Enterprise plans. 
+IP allowlisting enables account administrators to restrict access to Prefect Cloud APIs and the UI at the network level. 
+To learn more, please contact your account manager or the Prefect team at [email protected].
 
-To get started, use the Prefect CLI to add an IP address to the allowlist:
+Once the feature has been enabled for your team's Enterprise account, use the Prefect CLI to add an IP address to the allowlist:
 
 <Note>To help prevent accidental account lockouts, an update to an allowlist requires the requestor's current IP address to be on the list.</Note>