Update api-routes.mdx (#24935)

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docs/pages/preview/api-routes.mdx

@@ -322,7 +322,7 @@ Create a Netlify configuration file at the root of your project to redirect all
 
 [functions]
   # Include everything to ensure dynamic routes can be used.
-  included_files = ["dist/**/*"]
+  included_files = ["dist/**/*.html", "dist/_expo/functions/**/*", "dist/_expo/routes.json"]
 
 [[headers]]
   for = "/dist/_expo/functions/*"