fixup! Nat hole punch wire protocol

Author: emhane

discv5/discv5-wire.md

@@ -310,9 +310,9 @@ value in parentheses is the `notification-type`.
 
 ### RELAYMSG (0x02)
 
-    message-data      = [init-enr, nonce]
+    message-data      = [inr-enr, nonce]
     notification-type = 0x02
-    init-enr          = initiator ENR
+    inr-enr           = initiator ENR
     nonce             = uint96    -- nonce of timed out request
 
 ## Test Vectors