Fix duplicate title display in published content

- Removed duplicate H2 headings from introduction.md and strategy.md that matched YAML titles
- Fixed title capitalization consistency in index.yml
- This resolves duplicate titles showing in published Learn pages

Author: staleycyn

learn-pr/wwl-azure/design-ai-workloads/includes/1-introduction.md

@@ -1,5 +1,3 @@
-## Introduction
-
 This module helps you design and implement AI workloads on Azure. You learn how to choose the right mix of SaaS, PaaS, and IaaS solutions. Also how to align AI strategy with business goals, and apply best practices for governance, security, operations, and responsible AI. This module provides an overview of AI strategy, planning, design, governance, security, and management.
 
 :::image type="content" source="../media/strategy-steps.png" alt-text="Diagram of the units in the module.":::

learn-pr/wwl-azure/design-ai-workloads/includes/2-strategy.md

@@ -1,4 +1,3 @@
-## Create an AI Strategy
 
 In this unit, you focus on building an AI strategy. The first step is getting familiar with the main types of AI solutions available in Azure—Software as a Service (SaaS), Platform as a Service (PaaS), and Infrastructure as a Service (IaaS). Once you understand these options, it becomes easier to choose the Azure AI solution that fits your organization’s needs.
 

learn-pr/wwl-azure/design-ai-workloads/index.yml

@@ -9,7 +9,7 @@ metadata:
   ms.topic: module
   ms.service: azure-ai-services
   hidden: true
-title: "Design AI workloads on Azure"
+title: "Design AI Workloads on Azure"
 summary: Learn to design AI workloads using SaaS, PaaS, and IaaS solutions while aligning AI strategy with business goals and applying governance best practices.
 abstract: |
   After completing this module, you'll be able to: