doc: fix typo in fs.md

Fixes simple typo of `excludiing` to `excluding`.

PR-URL: #21579
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

doc/api/fs.md

@@ -4021,7 +4021,7 @@ added: v10.0.0
 * Returns: {Promise}
 
 Reads the contents of a directory then resolves the `Promise` with an array
-of the names of the files in the directory excludiing `'.'` and `'..'`.
+of the names of the files in the directory excluding `'.'` and `'..'`.
 
 The optional `options` argument can be a string specifying an encoding, or an
 object with an `encoding` property specifying the character encoding to use for