Remove debugging code from page source – 2018

Hey Kriesi Team,

As always, thank you for your great support.

I have a question about the Debugging Info for Theme support. I saw other topics who wrote about it, but they do not work for me:
https://kriesi.at/support/topic/remove-debugging-code-from-page-source-2/
https://kriesi.at/support/topic/remove-debugging-code-from-page-source/

Do I need to change something or how can this code work again? This comment is still visible in my website. At the end of my child functions.php I’ve got for now:
/***** HIDE debug theme info ******/
add_action(‘init’,’avia_remove_debug’);
function avia_remove_debug(){
remove_action(‘wp_head’,’avia_debugging_info’,1000);
remove_action(‘admin_print_scripts’,’avia_debugging_info’,1000);
}
/***** END HIDE debug theme info ******/

Kind regards,
Lambert