tests: Fix INPUT_EVENT specification

Author: jkczyz

tests/events/test-spec.md

@@ -99,7 +99,7 @@ compulsory (`even`).
 
 ## Input Events
 
-INPUT_EVENT := CONNECT | RECV | BLOCK | DISCONNECT | OPENCMD
+INPUT_EVENT := CONNECT | RECV | BLOCK | DISCONNECT | FUNDCHANCMD | INVOICECMD
 
 CONNECT := `connect:` SPACE+ CONNECT_OPTS
 CONNECT_OPTS := `privkey=` HEX64