If you look at other config.php file lines, you should notice they all have ticks enclosing the values.
Contract ...
Could advertise you need help:
https://moodle.org/mod/data/view.php?d=54
or seek a Moodle Partner that provides remote support;
or ... if remotely hosted with provider, find providers FAQ's/Docs and in conjunction with other related Google searches, etc., learn.
A good resource: https://www.digitalocean.com/community/tutorials
'SoS', Ken