Improve account details instructions

doc/subscriptions/index.md

@@ -130,25 +130,35 @@ instance, ensure you're purchasing enough seats to
 
 With the [Customers Portal](https://customers.gitlab.com/) you can:
 
-- [Change billing and company information](#change-billing-information)
+- [Change your personal details](#change-your-personal-details)
+- [Change your company details](#change-your-company-details)
 - [Change the payment method](#change-payment-method)
 - [Change the linked account](#change-the-linked-account)
 - [Change the associated namespace](#change-the-associated-namespace)
 - [Change customers portal account password](#change-customer-portal-account-password)
 
-### Change billing information
+### Change your personal details
 
-To change billing information:
+Your personal details are used on invoices. Your email address is used for the Customers Portal
+login and license-related email.
+
+To change your personal details, including name and billing address:
 
 1. Log in to the [Customers Portal](https://customers.gitlab.com/customers/sign_in).
-1. Select the **My account** drop-down and click on **Payment methods**.
-1. Make the required changes to the **Account Details** information.
+1. Select **My account > Account details**.
+1. Expand the **Personal details** section.
+1. Edit your personal details.
 1. Click **Save changes**.
 
-NOTE: **Note:**
-Future purchases will use the information in this section.
-The email listed in this section is used for the Customers Portal
-login and for license-related email communication.
+### Change your company details
+
+To change your company details, including company name and VAT number:
+
+1. Log in to the [Customers Portal](https://customers.gitlab.com/customers/sign_in).
+1. Select **My account > Account details**.
+1. Expand the **Company details** section.
+1. Edit the company details.
+1. Click **Save changes**.
 
 ### Change payment method