Fix inaccurate port forwarding information for ProtonVPN (#2191)

Signed-off-by: Jonah Aragon <github@aragon.science>
Signed-off-by: Daniel Gray <dngray@privacyguides.org>

docs/vpn.md

@@ -217,7 +217,7 @@ Proton VPN [recommends](https://protonvpn.com/blog/wireguard/) the use of WireGu
 
 #### :material-alert-outline:{ .pg-orange } Remote Port Forwarding
 
-Proton VPN currently only supports remote [port forwarding](https://protonvpn.com/support/port-forwarding/) on Windows, which may impact some applications. Especially Peer-to-peer applications like Torrent clients.
+Proton VPN currently only supports ephemeral remote [port forwarding](https://protonvpn.com/support/port-forwarding/) via NAT-PMP, with 60 second lease times. The Windows app provides an easy to access option for it, while on other operating systems you'll need to run your own [NAT-PMP client](https://protonvpn.com/support/port-forwarding-manual-setup/). Torrent applications often support NAT-PMP natively.
 
 #### :material-check:{ .pg-green } Mobile Clients
 

includes/abbreviations.en.txt

@@ -52,6 +52,8 @@
 *[MEID]: Mobile Equipment Identifier
 *[MFA]: Multi-Factor Authentication
 *[NVMe]: Nonvolatile Memory Express
+*[NAT]: Network address translation
+*[NAT-PMP]: NAT Port Mapping Protocol
 *[NTP]: Network Time Protocol
 *[OCI]: Open Container Initiative
 *[OCSP]: Online Certificate Status Protocol