Update billing invoice sections (#18684)

* add callout about invoices and remove line about invoices from any time

* remove extra line

* specify invoice types

content/billing/details.md

@@ -4,7 +4,12 @@ description: Learn how to update your billing information in Docker Hub
 keywords: payments, billing, subscription
 ---
 
-You can update the billing information for your personal account or for an organization. 
+You can update the billing information for your personal account or for an organization. When you update your billing information, these changes apply to future billing invoices.
+
+> **Important**
+>
+> You can't update an existing invoice, including paid and unpaid invoices.
+{ .important }
 
 The billing information provided appears on all your billing invoices. The email address provided is where Docker sends all invoices and other billing-related communication. For more information on the billing emails you receive, see [FAQs](faqs.md#what-billing-related-emails-will-i-receive-from-docker-hub).
 

content/billing/history.md

@@ -4,7 +4,7 @@ description: Discover how to view your billing history in Docker Hub
 keywords: payments, billing, subscription, invoices
 ---
 
-You can view the billing history and download past invoices for a personal account or organization at any time.
+You can view the billing history and download past invoices for a personal account or organization.
 
 ## Personal account