Fix incorrect param name in loader example (fixes #13680) (#13681)

Author: Willvillegas

contributors.yml

@@ -384,6 +384,7 @@
 - williamsdyyz
 - willsawyerrrr
 - willsmithte
+- Willvillegas
 - wkovacs64
 - woodywoodsta
 - xavier-lc

docs/start/data/custom.md

@@ -31,7 +31,7 @@ let router = createBrowserRouter([
         path: "shows/:showId",
         Component: Show,
         loader: ({ request, params }) =>
-          fetch(`/api/show/${params.id}.json`, {
+          fetch(`/api/show/${params.showId}.json`, {
             signal: request.signal,
           }),
       },