Update 1-Authentication/1-sign-in/README.md

redirect

Co-authored-by: Doğan Erişen <dogan.erisen@gmail.com>

Author: salman90

1-Authentication/1-sign-in/README.md

@@ -137,7 +137,7 @@ To manually register the apps, as a first step you'll need to:
 1. If you don't have a platform added, select **Add a platform** and select the **Single-page application** option.
     1. In the **Redirect URI** section enter the following redirect URIs:
         1. `http://localhost:3000`
-        1. `http://localhost:3000/redirect.html`
+        1. `http://localhost:3000/redirect`
     1. Click **Save** to save your changes.
 
 ##### Configure the client app (ms-identity-javascript-c1s1) to use your app registration