Fix italics in readme (vercel#19441)

examples/with-dynamic-app-layout/README.md

@@ -1,6 +1,6 @@
 # With dynamic `App` layout example
 
-Shows how to use _app.js to implement \_dynamic_ layouts for pages. This is achieved by attaching a static `Layout` property to each page that needs a different layout. In that way, once we use `_app.js` to wrap our pages, we can get it from `Component.Layout` and render it accordingly.
+Shows how to use `pages/_app.js` to implement _dynamic_ layouts for pages. This is achieved by attaching a static `Layout` property to each page that needs a different layout. In that way, once we use `pages/_app.js` to wrap our pages, we can get it from `Component.Layout` and render it accordingly.
 
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