doc: missing brackets

PR-URL: #32657
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>

doc/api/esm.md

@@ -1231,7 +1231,7 @@ console.log('I just set some globals!');
 
 const { createRequire } = getBuiltin('module');
 
-const require = createRequire(process.cwd + '/<preload>');
+const require = createRequire(process.cwd() + '/<preload>');
 // [...]
 `;
 }