Update README.md

Correct "on just 500 trillion tokens." to "on just 500 billion tokens."

README.md

@@ -27,7 +27,7 @@ CodeShell is a multi-language code LLM developed by the [Knowledge Computing Lab
 * **Complete Ecosystem**: In addition to the mega code model, open-source IDE plugins (for VS Code and JetBrains) are also available, forming a comprehensive open-source full-stack technology system.
 * **Lightweight Deployment**: Supports local C++ deployment, offering a lightweight and fast localized software development assistant solution.
 * **Comprehensive Evaluation**: Provides a multi-task evaluation system that supports full project context, covering code generation, code defect detection and repair, test case generation, and other common software development activities (to be open-sourced soon).
-* **Efficient Training**: Based on an efficient data governance system, CodeShell, even when starting from scratch, achieved outstanding performance with training on just 500 trillion tokens.
+* **Efficient Training**: Based on an efficient data governance system, CodeShell, even when starting from scratch, achieved outstanding performance with training on just 500 billion tokens.
 
 ## Quickstart