docs: remote function cannot be server-only modules (#14813)

* docs: remote function cannot be server-only modules

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

---------

Co-authored-by: Simon H <[email protected]>

Author: hyunbinseo

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

@@ -33,7 +33,7 @@ export default config;
 
 ## Overview
 
-Remote functions are exported from a `.remote.js` or `.remote.ts` file, and come in four flavours: `query`, `form`, `command` and `prerender`. On the client, the exported functions are transformed to `fetch` wrappers that invoke their counterparts on the server via a generated HTTP endpoint. Remote files must be placed in your `src` directory.
+Remote functions are exported from a `.remote.js` or `.remote.ts` file, and come in four flavours: `query`, `form`, `command` and `prerender`. On the client, the exported functions are transformed to `fetch` wrappers that invoke their counterparts on the server via a generated HTTP endpoint. Remote files can be placed anywhere in your `src` directory (except inside the `src/lib/server` directory), and third party libraries can provide them, too.
 
 ## query