Update docker.io/pretalx/standalone Docker tag to v2026

docs/guides/wiregueard-admin-vpn.md

@@ -11,12 +11,10 @@ tbd. where to add your key
 
 ## Example Config
 
-Replace `YOUR_IP_IN_DEC` with your IP in decimal, and `YOUR_IP_IN_HEX` with your IP in hexadecimal.
-
 ```
 [Interface]
 PrivateKey = YOUR_PRIVATE_KEY
-Address = 10.89.214.YOUR_IP_IN_DEC/32, 2a07:c481:1:37::YOUR_IP_IN_HEX
+Address = 172.31.202.YOUR_IP/32
 
 [Peer]
 PublicKey = fmlxjh3iOfpgrHQQpK3dyOD0BvDppGCUkFuMSroqQR4=