Update installation guide to Stop Nginx before the 'Setting up nginx and getting Let's Encrypt SSL certificaties' step

In the installation guide, before the step where it says to run the following,

certbot certonly --standalone --preferred-challenges http -d yourinstance.tld

Add step to stop nginx first.

sudo systemctl stop nginx

The following error is displayed if you do not stop nginx first.
EDIT: There’s also another error message that’s displayed even if it’s not for a cert renewal. So it’s critical that this step is added.

Attempting to renew cert from /etc/letsencrypt/renewal/somedomain.com.conf produced an unexpected error: Problem binding to port 443: Could not bind to IPv4 or IPv6.. Skipping.

Related topic: lets encrypt - Letsencrypt renewal fails: Could not bind to IPv4 or IPv6.. Skipping - Stack Overflow