docs: update README.md (#2)

Recommending adding a "why" this is important to the README.

Author: kristenwomack

README.md

@@ -17,7 +17,7 @@
 
 ## Overview
 
-This sample shows how to to provision an [Azure OpenAI](https://learn.microsoft.com/azure/ai-services/openai/overview) account with an [RBAC role](https://learn.microsoft.com/azure/role-based-access-control/built-in-roles) permission for your user account to access, so that you can use the OpenAI API SDKs with [keyless (Entra) authentication](https://learn.microsoft.com/entra/identity/managed-identities-azure-resources/overview).
+This sample shows how to to provision an [Azure OpenAI](https://learn.microsoft.com/azure/ai-services/openai/overview) account with an [RBAC role](https://learn.microsoft.com/azure/role-based-access-control/built-in-roles) permission for your user account to access, so that you can use the OpenAI API SDKs with [keyless (Entra) authentication](https://learn.microsoft.com/entra/identity/managed-identities-azure-resources/overview). Keyless authentication is a recommended security practice to reduce risks with API keys.
 
 ## Getting started