Merge pull request #1364 from minhanh-phan/openai/migration-update

[OpenAI] Update Migration Guide

Author: prmerger-automator[bot]

articles/ai-services/openai/how-to/migration-javascript.md

@@ -43,14 +43,14 @@ const azureADTokenProvider = getBearerTokenProvider(credential, scope);
 
 ### (Highly Discouraged) API Key
 
-API keys are not recommended for production use because they are less secure than other authentication methods. However, if you are using an API key to authenticate `OpenAIClient` or `AssistantsClient`, an `AzureKeyCredential` object must be created as follows:
+API keys are not recommended for production use because they are less secure than other authentication methods. Previously, `AzureKeyCredential` objects were created as follows to authenticate `OpenAIClient` or `AssistantsClient`:
 
 ```typescript
 import { AzureKeyCredential } from "@azure/openai";
 const apiKey = new AzureKeyCredential("your API key");
 ```
 
-Authenticating `AzureOpenAI` with an API key involves setting the `AZURE_OPENAI_API_KEY` environment variable or setting the `apiKey` string property in the options object when creating the `AzureOpenAI` client.
+On the other hand, `AzureOpenAI` can be authenticated with an API key by setting the `AZURE_OPENAI_API_KEY` environment variable or by setting the `apiKey` string property in the options object when creating the `AzureOpenAI` client.
 
 [!INCLUDE [Azure key vault](~/reusable-content/ce-skilling/azure/includes/ai-services/security/azure-key-vault.md)]