Remove a couple more PrivateStorageSecrets references

They're only example but they scare me when they show up in grep results

nixos/modules/monitoring/vpn/client.nix

@@ -48,7 +48,7 @@ in {
     };
     endpointPublicKeyFile = lib.mkOption {
       type = lib.types.path;
-      example = lib.literalExample ../PrivateStorageSecrets/monitoringvpn/server.pub;
+      example = lib.literalExample ./monitoringvpn/server.pub;
       description = ''
         File with base64 public key generated by <command>cat private.key | wg pubkey > pubkey.pub</command>.
       '';
@@ -71,4 +71,3 @@ in {
     };
   };
 }
-

nixos/modules/monitoring/vpn/server.nix

@@ -51,7 +51,7 @@ in {
     };
     pubKeysPath = lib.mkOption {
       type = lib.types.path;
-      example = lib.literalExample ../PrivateStorageSecrets/monitoringvpn;
+      example = lib.literalExample ./monitoringvpn;
       description = ''
         The path to the directory that holds the public keys.
       '';
@@ -69,4 +69,3 @@ in {
     };
   };
 }
-