Update platform-includes/getting-started-config/javascript.react-router.mdx

Co-authored-by: Alex Krawiec <[email protected]>

Author: chargome

platform-includes/getting-started-config/javascript.react-router.mdx

@@ -78,7 +78,7 @@ export function ErrorBoundary({ error }: Route.ErrorBoundaryProps) {
 
 ### Server-Side Setup
 
-Create a `instrument.server.mjs` file in the root of your app:
+Create an `instrument.server.mjs` file in the root of your app:
 
 ```js {filename: instrument.server.mjs}
 import * as Sentry from "@sentry/node";