Update two-payment-methods.mdx (#24442)

Quoting the dash specific error string to improve findability

Author: simon-says

src/content/partials/billing/two-payment-methods.mdx

@@ -5,8 +5,8 @@
 
 :::note
 
-You cannot have more than two payment methods associated with your account, and you may be unable to add or edit an existing payment method if your account has too many payment methods. 
+You may receive the error message "Cannot add more than two payment methods." when trying to add additional methods.
 
 If you are unable to add or edit a payment method, [delete a payment method](/billing/update-billing-info/#delete-a-payment-method) and try again.
 
-:::
+:::