Update necessary_ports.md (#31487)

Co-authored-by: Rachael Rose Renk <91027132+rachaelrenk@users.noreply.github.com>

Author: Wilson Wong

data/reusables/enterprise_installation/necessary_ports.md

@@ -6,7 +6,7 @@
 | 122  | SSH     | Instance shell access. _The default SSH port (22) is dedicated to application git+ssh network traffic._ |
 | 161/UDP | SNMP | Required for network monitoring protocol operation. |
 | 443  | HTTPS   | Web application and Git over HTTPS access. |
-| 1194/UDP | VPN | Secure replication network tunnel in high availability configuration. |
+| 1194/UDP | VPN | Secure replication network tunnel in high availability configuration. _Encrypted using WireGuard._ |
 | 8080 | HTTP    | Plain-text web based {% data variables.enterprise.management_console %}. _Not required unless SSL is disabled manually._ |
 | 8443 | HTTPS   | Secure web based {% data variables.enterprise.management_console %}. _Required for basic installation and configuration._ |
 | 9418 | Git     | Simple Git protocol port. Clone and fetch operations to public repositories only. _Unencrypted network communication._ {% data reusables.enterprise_installation.when-9418-necessary %}  |