doc: add simple example to rename function

Added a simple example showing how to rename
a file.

Refs: https://github.com/nodejs/node/issues11135

PR-URL: https://github.com/nodejs/node/pull/18812
Reviewed-By: Matheus Marchini <matheus@sthima.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 13 insertions, 2 deletions

diff --git a/doc/api/fs.md b/doc/api/fs.md
index a864503dbd..d1eb765aad 100644
--- a/doc/api/fs.md
+++ b/doc/api/fs.md
@@ -2623,8 +2623,19 @@ changes:
 * `callback` {Function}
   * `err` {Error}
 
-Asynchronous rename(2). No arguments other than a possible exception are given
-to the completion callback.
+Asynchronously rename file at `oldPath` to the pathname provided
+as `newPath`. In the case that `newPath` already exists, it will
+be overwritten. No arguments other than a possible exception are
+given to the completion callback.
+
+See also: rename(2).
+
+```js
+fs.rename('oldFile.txt', 'newFile.txt', (err) => {
+  if (err) throw err;
+  console.log('Rename complete!');
+});
+```
 
 ## fs.renameSync(oldPath, newPath)
 <!-- YAML