add code fences (#26409)

Author: muescha

docs/tutorial/ecommerce-tutorial/index.md

@@ -371,7 +371,7 @@ export default function Products(props) {
 
 You can validate your query and see what data is being returned in GraphiQL, which is available at `http://localhost:8000/___graphql` when running `gatsby develop`.
 
-Once you're happy with your query, create a new page where you can import the newly created Products component:
+Once you're happy with your query, create a new page where you can import the newly created `Products` component:
 
 ```jsx:title=src/pages/advanced.js
 import React from "react"