Update README.md

Co-authored-by: Atif Ali <[email protected]>

Author: DevelopmentCats

registry/coder-labs/modules/codex/README.md

@@ -85,7 +85,7 @@ module "codex" {
 
 ## Configuration
 
-### **Default Configuration**
+### Default Configuration
 
 When no custom `base_config_toml` is provided, the module uses these secure defaults: