Update part3b.md

Typo

Author: MarcGuay

src/content/3/en/part3b.md

@@ -339,7 +339,7 @@ The setup that is ready for a product deployment looks as follows:
 
 ![diagram of deployment ready react app](../../images/3/101.png)
 
-Unlike when running the app in a development environment, everything is now in the same node/express-backend that runs in localhost:3001. When the browser goes to the page, the file <i>index.html</i> is rendered. That causes the browser to fetch the product version of the React app. Once it starts to run, it fetches the json-data from the address localhost:3001/api/notes.
+Unlike when running the app in a development environment, everything is now in the same node/express-backend that runs in localhost:3001. When the browser goes to the page, the file <i>index.html</i> is rendered. That causes the browser to fetch the production version of the React app. Once it starts to run, it fetches the json-data from the address localhost:3001/api/notes.
 
 ### The whole app to the internet