Update README to clarify cost and latency benefits for API usage limits

Author: robertpiosik

README.md

@@ -38,7 +38,7 @@ Code Web Chat is an open-source and privacy-first **AI coding toolkit for VS Cod
 
 Code Web Chat is **designed from the ground-up for [prompt caching](https://developers.openai.com/api/docs/guides/prompt-caching)**. Recently modified or selected files are intelligently ordered and there is zero tool definition overhead.
 
-Offload chatbots. Reduce latency by up to 80% and input token costs by up to 90%.
+Make the most of your usage limits. When calling APIs—reduce latency by up to 80% and input token costs by up to 90%.
 
 ## Enabling autofill