Fix README wording

Author: aolingge

README.md

@@ -31,7 +31,7 @@ to start the development server. You can then visit [http://localhost:3000](http
   - **Python FastAPI**: if you select this option, you’ll get full-stack Python application powered by the [llama-index Python package](https://pypi.org/project/llama-index/) and [LlamaIndex Server for Python](https://pypi.org/project/llama-index-server/)
 - The app uses OpenAI by default, so you'll need an OpenAI API key, or you can customize it to use any of the dozens of LLMs we support.
 
-Here's how it looks like:
+Here's what it looks like:
 
 https://github.com/user-attachments/assets/d57af1a1-d99b-4e9c-98d9-4cbd1327eff8