logger: refer to tutorial
* If you often change the file, you might want to set CMAKE_LINK_DEPENDS_NO_SHARED
* to avoid relinking everything.
*
+ * Do not commit changes do this file, except if you want to change the default.
+ * In that case, make sure to update also doc/tutorials/logger.md
+ *
* @copyright BSD License (see LICENSE.md or https://www.libelektra.org)
*/
