Add specific DNSOverTLS option

Author: RebeccaTamachiro

src/content/docs/1.1.1.1/setup/linux.mdx

@@ -53,11 +53,12 @@ sudo <EDITOR> /etc/systemd/resolved.conf
 [Resolve]
 DNS=1.1.1.1
 ```
-To use DNS over TLS, add `#one.one.one.one` as in the following example:
+To use DNS over TLS, add `#one.one.one.one` and set `DNSOverTLS` to `yes`, as in the following example:
 
 ```txt
 [Resolve]
 DNS=1.1.1.1#one.one.one.one
+DNSOverTLS=yes
 ```
 
 ## Use graphical user interface (GUI)