[Squash] nit

Co-authored-by: Richard Lau <rlau@redhat.com>

Author: jasnell

doc/api/fs.md

@@ -18,7 +18,7 @@ To use this module:
 import * as fs from 'fs';  // Sync and callback APIs
 ```
 
-```js ems
+```js esm
 import * as fs from 'fs/promises';  // Promise APIs
 ```