PHP Parse error: syntax error, unexpected ‘/’

Hey everyone, im faceing a problem here yesterday when i tried to configure background updates with WP_AUTO_UPDATE_CORE and saved the site crashed and i got a http error 500
i put the code back to its original state but now if i check my logs is see this:

PHP Parse error: syntax error, unexpected ‘/’, expecting end of file in …. wp-config.php on line 21

(here the line code of wp-config.php)
https://ibb.co/tQvp77R

the next second error it gives is
AH01215: PHP Parse error: syntax error, unexpected ‘/’, expecting end of file in ..wp-config.php on line 21: .. wp-index.php

AH01215: :index.php

(here the index.php line of code)
https://ibb.co/jh1bhdY

is there a way to resolve this?
or should i contact my domainhost?

thanks in advance!