Update _billing.mdx

Author: AmberAlston

docs/partials/cmx/_billing.mdx

@@ -3,5 +3,5 @@ Clusters created with Compatibility Matrix are billed by the minute. Per-minute
 You are billed only for the time that the cluster is in a `running` status. You are _not_ billed for the time that it takes Compatibility Matrix to create and tear down clusters, including when the cluster is in an `assigned` status.
 
 To create clusters with Compatibility Matrix, you must have credits in your Vendor Portal account.
-If you have a contract, you can purchase credits by logging in to the Vendor Portal and going to [**Compatibility Matrix > Buy $500 additional credits**](https://vendor.replicated.com/compatibility-matrix).
+If you have a contract, you can purchase credits by logging in to the Vendor Portal and going to [**Compatibility Matrix > Buy additional credits**](https://vendor.replicated.com/compatibility-matrix).
 Otherwise, to request credits, log in to the Vendor Portal and go to [**Compatibility Matrix > Request more credits**](https://vendor.replicated.com/compatibility-matrix).