added step to add reply url

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cc: @jeevansd

Author: MarileeTurscak-MSFT

articles/active-directory/saas-apps/github-tutorial.md

@@ -162,6 +162,8 @@ In this section, you'll enable B.Simon to use Azure single sign-on by granting a
     c. Open the downloaded certificate from Azure portal in notepad, paste the content into the **Public Certificate** textbox.
 
     d. Click on **Edit** icon to edit the **Signature Method** and **Digest Method** from **RSA-SHA1** and **SHA1** to **RSA-SHA256** and **SHA256** as shown below.
+    
+    e. Update the **assertion consumer service URL (Reply URL)** from the default URL so that it the URL in Github matches the URL in the Azure app registration.
 
     ![image](./media/github-tutorial/tutorial_github_sha.png)
 
@@ -219,4 +221,4 @@ When you click the GitHub tile in the Access Panel, you should be automatically
 
 - [Try GitHub with Azure AD](https://aad.portal.azure.com/)
 
-- [What is session control in Microsoft Cloud App Security?](https://docs.microsoft.com/cloud-app-security/proxy-intro-aad)
+- [What is session control in Microsoft Cloud App Security?](https://docs.microsoft.com/cloud-app-security/proxy-intro-aad)