fix: update notification delay ACP help text

public/language/en-GB/admin/settings/chat.json

@@ -6,7 +6,7 @@
 	"max-length": "Maximum length of chat messages",
 	"max-room-size": "Maximum number of users in chat rooms",
 	"delay": "Time between chat messages in milliseconds",
-	"notification-delay": "Notification delay for chat messages",
+	"notification-delay": "Notification delay for chat messages. (0 for no delay)",
 	"restrictions.seconds-edit-after": "Number of seconds a chat message will remain editable. (0 disabled)",
 	"restrictions.seconds-delete-after": "Number of seconds a chat message will remain deletable. (0 disabled)"
 }