fix broken link

Author: cloga

articles/machine-learning/prompt-flow/how-to-integrate-with-langchain.md

@@ -47,7 +47,7 @@ You can customize the environment that you use to run this flow by adding packag
 
 ### Convert credentials to prompt flow connection
 
-When developing your LangChain code, you might have [defined environment variables to store your credentials, such as the AzureOpenAI API KEY](https://python.langchain.com/docs/integrations/llms/azure_openai_example), which is necessary for invoking the AzureOpenAI model.
+When developing your LangChain code, you might have [defined environment variables to store your credentials, such as the AzureOpenAI API KEY](https://python.langchain.com/docs/integrations/platforms/microsoft), which is necessary for invoking the AzureOpenAI model.
 
 :::image type="content" source="./media/how-to-integrate-with-langchain/langchain-env-variables.png" alt-text="Screenshot of Azure OpenAI example in LangChain. " lightbox = "./media/how-to-integrate-with-langchain/langchain-env-variables.png":::