Merge branch 'renew-less-users-docs' into 'master'

Docs: Reduce seats automatically on .COM

See merge request gitlab-org/gitlab!44442

doc/subscriptions/gitlab_com/index.md

@@ -150,10 +150,11 @@ _true up_ process.
 
 ### Renew or change a GitLab.com subscription
 
-NOTE: **Note:**
-To renew for more users than are currently active in your GitLab.com plan,
-contact our sales team via `renewals@gitlab.com` for assistance as this can't be
-done in the Customers Portal.
+You can adjust the number of users before renewing your GitLab.com subscription.
+
+- To renew for more users than are currently included in your GitLab.com plan, [add users to your subscription](#add-users-to-your-subscription).
+- To renew for fewer users than are currently included in your GitLab.com plan,
+either [disable](../../user/admin_area/activating_deactivating_users.md#deactivating-a-user) or [block](../../user/admin_area/blocking_unblocking_users.md#blocking-a-user) the user accounts you no longer need.
 
 For details on upgrading your subscription tier, see
 [Upgrade your GitLab.com subscription tier](#upgrade-your-gitlabcom-subscription-tier).