fix link

Author: lgayhardt

articles/ai-foundry/concepts/prompt-flow.md

@@ -108,5 +108,5 @@ If the prompt flow tools in Azure AI Foundry portal don't meet your requirements
 
 ## Next steps
 
-- [Build with prompt flow in Azure AI Foundry portal](flow-develop.md)
+- [Build with prompt flow in Azure AI Foundry portal](../how-to/flow-develop.md)
 - [Get started with prompt flow in VS Code](https://microsoft.github.io/promptflow/how-to-guides/quick-start.html)