Add version information for new Pages feature

doc/administration/pages/index.md

@@ -238,7 +238,7 @@ control over how the Pages daemon runs and serves content in your environment.
 | `artifacts_server_url`                  | API URL to proxy artifact requests to. Defaults to GitLab `external URL` + `/api/v4`, for example `https://gitlab.com/api/v4`. When running a [separate Pages server](#running-gitlab-pages-on-a-separate-server), this URL must point to the main GitLab server's API. |
 | `auth_redirect_uri`                     | Callback URL for authenticating with GitLab. Defaults to project's subdomain of `pages_external_url` + `/auth`. |
 | `auth_secret`                           | Secret key for signing authentication requests. Leave blank to pull automatically from GitLab during OAuth registration. |
-| `client_cert_key_pairs`                 | Client certificates and keys used for mutual TLS with the GitLab API. See [Support mutual TLS when calling the GitLab API](#support-mutual-tls-when-calling-the-gitlab-api) for details. |
+| `client_cert_key_pairs`                 | Client certificates and keys used for mutual TLS with the GitLab API. See [Support mutual TLS when calling the GitLab API](#support-mutual-tls-when-calling-the-gitlab-api) for details. [Introduced](https://gitlab.com/gitlab-org/gitlab-pages/-/issues/548) in GitLab 14.8. |
 | `dir`                                   | Working directory for configuration and secrets files. |
 | `enable`                                | Enable or disable GitLab Pages on the current system. |
 | `external_http`                         | Configure Pages to bind to one or more secondary IP addresses, serving HTTP requests. Multiple addresses can be given as an array, along with exact ports, for example `['1.2.3.4', '1.2.3.5:8063']`. Sets value for `listen_http`. |
@@ -514,6 +514,8 @@ For Omnibus, this is fixed by [installing a custom CA in Omnibus GitLab](https:/
 
 ### Support mutual TLS when calling the GitLab API
 
+> [Introduced](https://gitlab.com/gitlab-org/gitlab-pages/-/issues/548) in GitLab 14.8.
+
 If GitLab has been [configured to require mutual TLS](https://docs.gitlab.com/omnibus/settings/nginx.html#enable-2-way-ssl-client-authentication), you need to add the client certificates to Pages:
 
 1. Configure in `/etc/gitlab/gitlab.rb`: