fix: add comma for clarity (#2209)

Author: nimonian

content/blog/40.building-nuxt-mcp.md

@@ -176,7 +176,7 @@ export default defineMcpResource({
 })
 ```
 
-Unlike tools which are model-controlled, resources are application-driven, the host application determines how to incorporate them based on user needs, such as through UI elements for explicit selection or automatic context inclusion.
+Unlike tools, which are model-controlled, resources are application-driven, the host application determines how to incorporate them based on user needs, such as through UI elements for explicit selection or automatic context inclusion.
 
 ### Prompts: Reusable templates