chore: Don't use directory names and use plain english instead

src/markdown-pages/build-apps/build-hello-world-app.mdx

@@ -222,7 +222,7 @@ nr1 create
 
   <Step>
 
-Select **catalog**, which creates a stub in your project under the `catalog` directory in the root directory and any launchers, Nerdlets, or visualizations directories. Here's how the results might look in your code editor:
+Select **catalog**, which creates a stub in your project under the _catalog_ directory in the root directory and any launcher, Nerdlet, or visualization directory. Here's how the results might look in your code editor:
 
 ![Catalog stub](../../images/create-hello-world/new-catalog-stub.png)