Update ToC

Hands-on lab/HOL step-by step - Azure Blockchain.md

@@ -33,9 +33,8 @@ Microsoft and the trademarks listed at <https://www.microsoft.com/en-us/legal/in
   - [Requirements](#requirements)
   - [Exercise 1: Setup Azure Active Directory Tenant](#exercise-1-setup-azure-active-directory-tenant)
     - [Task 1: Create Azure AD Tenant](#task-1-create-azure-ad-tenant)
-        - [Task 2: Create App Registration](#task-2-create-app-registration)
-        - [Task 3: Create Azure AD Administrator Group](#task-3-create-azure-ad-administrator-group)
-        - [Task 4: Add Administrator User](#task-4-add-administrator-user)
+    - [Task 2: Create Azure AD Administrator Group](#task-2-create-azure-ad-administrator-group)
+    - [Task 3: Add Administrator User](#task-3-add-administrator-user)
   - [Exercise 2: Deploy Azure Blockchain Workbench](#exercise-2-deploy-azure-blockchain-workbench)
     - [Task 1: Generate SSH Public / Private Key](#task-1-generate-ssh-public--private-key)
     - [Task 2: Deploy Azure Blockchain Workbench](#task-2-deploy-azure-blockchain-workbench)