docs: fix bad export from remote module (#15650)

you can't export anything from a `.remote.ts` file other than remote
functions — the example in the docs is broken

Author: Rich-Harris

documentation/docs/20-core-concepts/60-remote-functions.md

@@ -392,13 +392,22 @@ Because our form contains a `file` input, we've added an `enctype="multipart/for
 
 In the case of `radio` and `checkbox` inputs that all belong to the same field, the `value` must be specified as a second argument to `.as(...)`:
 
+```js
+/// file: constants.js
+export const operatingSystems = /** @type {const} */ (['windows', 'mac', 'linux']);
+export const languages = /** @type {const} */ (['html', 'css', 'js']);
+```
+
 ```js
 /// file: data.remote.js
+// @filename: constants.js
+export const operatingSystems = /** @type {const} */ (['windows', 'mac', 'linux']);
+export const languages = /** @type {const} */ (['html', 'css', 'js']);
+// @filename: index.js
 import * as v from 'valibot';
 import { form } from '$app/server';
 // ---cut---
-export const operatingSystems = /** @type {const} */ (['windows', 'mac', 'linux']);
-export const languages = /** @type {const} */ (['html', 'css', 'js']);
+import { operatingSystems, languages } from './constants';
 
 export const survey = form(
 	v.object({