fix: typo in files docs

Signed-off-by: Ferdinand Thiessen <[email protected]>

Author: susnux

developer_manual/client_apis/files.rst

@@ -33,7 +33,7 @@ the ``event-bus`` and use the following events:
 All these events use a Node as argument. You can use a webdav client (for example, by using the davGetClient function from `@nextcloud/files <https://nextcloud-libraries.github.io/nextcloud-files/>`__) to retrieve a node from a file's name.
 
 Examples
--------
+--------
 
 .. code-block:: ts