Fix a typo and a missing exit argument

stories/demo.js

@@ -99,9 +99,10 @@ stories.push({
         },
         "descend": {
           "target": "Stairs",
-          "desc": "Dare you go down the stiars?",
+          "desc": "Dare you go down the stairs?",
           "hooks": [
-            (room, state) => {
+            (room, exit, state) => {
+              console.log(state)
               print(["You're very concerned that you'll fall down all these stairs."]);
               return false;
             }