Correct usage format for cbx2bbf command

Fix formatting for cbx2bbf usage example in README.

Author: ef1500

readme.md

@@ -36,7 +36,8 @@ Once installed, two command-line tools will be available globally: `cbx2bbf` and
 ### `cbx2bbf`: Create BBF Files from CBZ/Images
 
 **Usage:**
-```cbx2bbf <inputs...> [options] --output <output.bbf>
+```
+cbx2bbf <inputs...> [options] --output <output.bbf>
 ```
 
 **Inputs:**
@@ -123,4 +124,4 @@ Contributions, issues, and feature requests are welcome! For libbbf, free to che
 
 This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.
 
----
+---