Update MS doc about how to use Microsoft identity platform in application developed by Spring framework

[chenrujun]

Context

Now here are a lot of MS docs about Managed identity and Spring framework, but these pages didn't give the best solution. For example: these paged should introduce spring-security or spring-cloud-azure-azure-active-directory.

1. https://docs.microsoft.com/en-us/azure/active-directory/develop/tutorial-v2-asp-webapp
2. https://docs.microsoft.com/en-us/azure/developer/java/spring-framework/spring-boot-starter-for-azure-active-directory-developer-guide
3. https://docs.microsoft.com/en-us/azure/active-directory/develop/sample-v2-code

Problem

Not provide the best solution in these pages may misleading our customers.

Goal

Make MS docs give the best solution about using Microsoft identity platform in Spring Boot application.