Add note about 2001:db8::/32

docs/content/examples/tutorials/routed.md

@@ -56,6 +56,13 @@ Pick an IPv4 and IPv6 subnet for your clients and add static routes on your rout
 
 ### Example
 
+/// note | 2001:db8::/32
+
+The *documentation prefix* `2001:db8::/32` (RFC 3849) used in this example is not meant for production use, replace it with your own ISP-assigned IPv6 prefix (GUA) or local prefix (LUA)
+
+///
+
+
 I want my WireGuard clients in `192.168.0.0/24` and `2001:db8:abc:0::/64`.
 
 - Routed IPv4 subnet: `192.168.0.0/24`