Adding missing NPM module

Also fixed the instruction on inserting the MSAL initialization code.

Author: jasonjoh

tutorial/02-create-app.md

@@ -55,7 +55,7 @@ Before moving on, install some additional packages that you will use later:
 1. Run the following command in your CLI.
 
     ```Shell
-    npm install [email protected] [email protected] [email protected] [email protected] [email protected] [email protected]
+    npm install [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected]
     npm install @azure/[email protected] @microsoft/[email protected] [email protected] [email protected] [email protected]
     ```
 

tutorial/04-add-aad-auth.md

@@ -19,7 +19,7 @@ In this exercise you will extend the application from the previous exercise to s
 
 ## Implement sign-in
 
-1. Locate the line `var indexRouter = require('./routes/index');` in **./app.js**. Insert the following code **before** that line.
+1. Locate the line `var app = express();` in **./app.js**. Insert the following code **after** that line.
 
     :::code language="javascript" source="../demo/graph-tutorial/app.js" id="MsalInitSnippet":::