Merge branch 'rz_pages_letsencrypt' into 'master'

Add caution that this feature requires 2 IP's

See merge request gitlab-org/gitlab-ce!31962

doc/user/project/pages/custom_domains_ssl_tls_certification/lets_encrypt_integration.md

@@ -21,6 +21,9 @@ such as [#64870](https://gitlab.com/gitlab-org/gitlab-ce/issues/64870).
 See all the related issues linked from this [issue's description](https://gitlab.com/gitlab-org/gitlab-ce/issues/28996)
 for more information.
+Note: **Note:**
+Using this feature requires **2 IP addresses** to be configured to the machine.
+
 ## Requirements
 Before you can enable automatic provisioning of a SSL certificate for your domain, make sure you have: