Merge branch 'patch-259' into 'master'

Add clarifications to ### Change your personal details

See merge request gitlab-org/gitlab!45539

doc/subscriptions/index.md

@@ -84,7 +84,7 @@ With the [Customers Portal](https://customers.gitlab.com/) you can:
 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:
+To change your personal details, including name, billing address, and email address:
 
 1. Log in to the [Customers Portal](https://customers.gitlab.com/customers/sign_in).
 1. Select **My account > Account details**.