docs: add info about key-reuse and dns name or ip address

Author: tprasadtp

README.md

@@ -46,6 +46,10 @@ Images are published at [ghcr.io/tprasadtp/protonwire][ghcr].
 
 ## Generating WireGuard Private Key
 
+> [!IMPORTANT]
+>
+> It is recommended to use unique private key for each instance of the the VPN container.
+
 - Log in to ProtonVPN and go to **Downloads** → **WireGuard configuration**.
 - Enter a name for the key, and select features to enable like NetShield and VPN Accelerator & click create.
   Some users have reported issues (#236,#211) when NetShield is set to `Block malware, ads and trackers`.
@@ -97,7 +101,8 @@ in following locations.
 ## PROTONVPN_SERVER
 
 This should be server DNS name like, `node-nl-01.protonvpn.net` or IP address like
-`91.229.23.180`. Though server name like `NL#1`(or `NL-1`) is supported it is not recommended.
+`91.229.23.180`. Server name like `NL#1`(or `NL-1`) may work for pro servers, it is
+_not recommended_.
 
 > [!IMPORTANT]
 >

docs/help.md

@@ -94,6 +94,16 @@ protonwire server-info {SERVER_NAME_OR_IP}
 [•] 89.39.107.188        : MTNPR632U9GOxI+B8dMP+KgMJVEO2xQPrem2SuDfTkM= (Public Key)
 ```
 
+## Server verification fails due to incorrect exit IP
+
+```log
+[ERROR   ] Expected to be connected to server xx.xx.244.154, but is connected to NL-FREE#338117(node-nl-153.protonvpn.net)
+[ERROR   ] Retry (5/5) after 2 seconds
+[ERROR   ] Failed to verify connection!
+```
+
+Please verify that you are using DNS name or IP address for the server. See FAQ above for more info.
+
 ## tmpfs or `/tmp` issues with containers
 
 Please use `tmpfs` mounts for `/tmp`