Created subsection for SDK migration

Author: jboback

articles/cognitive-services/language-service/question-answering/how-to/migrate-qnamaker.md

@@ -22,9 +22,11 @@ To successfully migrate knowledge bases, **the account performing the migration
 
 Resource level settings such as Role-based access control (RBAC) are not migrated to the new resource. These resource level settings would have to be reconfigured for the language resource post migration. You will also need to [re-enable analytics](analytics.md) for the language resource.
 
-If you're migrating the SDK, check out the [SDK Migration Guide](https://github.com/Azure/azure-sdk-for-net/blob/Azure.AI.Language.QuestionAnswering_1.1.0-beta.1/sdk/cognitivelanguage/Azure.AI.Language.QuestionAnswering/MigrationGuide.md)
+## Steps to migrate SDKs
 
-## Steps to migrate
+This [SDK Migration Guide](https://github.com/Azure/azure-sdk-for-net/blob/Azure.AI.Language.QuestionAnswering_1.1.0-beta.1/sdk/cognitivelanguage/Azure.AI.Language.QuestionAnswering/MigrationGuide.md) is intended to assist in the migration to the new Question Answering client library, Azure.AI.Language.QuestionAnswering, from the old one, Microsoft.Azure.CognitiveServices.Knowledge.QnAMaker. It will focus on side-by-side comparisons for similar operations between the two packages.
+
+## Steps to migrate knowledge bases
 
 You can follow the steps below to migrate knowledge bases: