fix typo

Author: ericbrown99

docs/mini-apps/quickstart/migrate-existing-apps.mdx

@@ -60,7 +60,7 @@ Once your app has loaded, call `sdk.actions.ready()` to hide the loading splash
 <Step title="Add the Manifest">
 Copy the example manifest below and update each field in the `miniapp` object.
 
-Update your app to host the manifestfile at `https://www.your-domain.com/.well-known/farcaster.json`.
+Update your app to host the manifest file at `https://www.your-domain.com/.well-known/farcaster.json`.
 
 The manifest file is used to verify ownership of your app and contains metadata to power search, discovery, and rich embeds in the Base App.