Remove incorrect statement on when to use prompt flow (Azure-Samples#338)

- Remove incorrect statement about prompt flow. If you want customisations, that is a good tool to use.
- I've not added any additional information as I believe the table below explains clearly enough when to use each tool

Required by Azure-Samples#142

Author: adamdougal

README.md

@@ -21,7 +21,7 @@ This repository provides a template for setting up the solution accelerator, alo
 
 ### When should you use this repo? 
 
-If you need to customize your scenario beyond what [Azure OpenAI on your data](https://learn.microsoft.com/azure/ai-services/openai/concepts/use-your-data) offers out-of-the-box, use this repository. If you don't require customizations, use [Azure Machine Learning prompt flow](https://learn.microsoft.com/en-us/azure/machine-learning/prompt-flow/overview-what-is-prompt-flow).
+If you need to customize your scenario beyond what [Azure OpenAI on your data](https://learn.microsoft.com/azure/ai-services/openai/concepts/use-your-data) offers out-of-the-box, use this repository.
 
 The accelerator presented here provides several options, for example:
 * The ability to ground a model using both data and public web pages