doc: fix typo on fs docs

PR-URL: #31620
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/fs.md

@@ -1949,7 +1949,7 @@ Node.js callbacks. `fs.existsSync()` does not use a callback.
 
 ```js
 if (fs.existsSync('/etc/passwd')) {
-  console.log('The file exists.');
+  console.log('The path exists.');
 }
 ```