Update README.md (change to ownership command) (#1970)

* Update README.md

I believe the owner and group of the `chown` command here are mixed up. As it was caused a permissions issue, with the service being unable to read the directory.

* Update README.md

* Update README.md

Revert changes back to the original suggested changes

dist/init/linux-systemd/README.md

@@ -46,7 +46,7 @@ sudo useradd \
 sudo mkdir /etc/caddy
 sudo chown -R root:www-data /etc/caddy
 sudo mkdir /etc/ssl/caddy
-sudo chown -R www-data:root /etc/ssl/caddy
+sudo chown -R root:www-data /etc/ssl/caddy
 sudo chmod 0770 /etc/ssl/caddy
 ```