Update llm-tool.md

Author: ShawnJackson

articles/machine-learning/prompt-flow/tools-reference/llm-tool.md

@@ -16,7 +16,7 @@ ms.date: 11/02/2023
 
 # LLM tool
 
-The large language model (LLM) tool for prompt flow enables you to take advantage of widely used large language models like [OpenAI](https://platform.openai.com/) or [Azure OpenAI Service](../../../cognitive-services/openai/overview.md) for natural language processing.
+The large language model (LLM) tool in prompt flow enables you to take advantage of widely used large language models like [OpenAI](https://platform.openai.com/) or [Azure OpenAI Service](../../../cognitive-services/openai/overview.md) for natural language processing.
 
 Prompt flow provides a few different large language model APIs: