Make examples/hosts look cleaner

Putting a lot of comments inbetween `[matrix-servers]` and the example
host line may make someone decide to clean up the comment
and accidentally skip-over the `[matrix-servers]` part.

examples/hosts

@@ -1,4 +1,3 @@
-[matrix-servers]
 # We explicitly ask for your server's external IP address, because the same value is used for configuring Coturn.
 #
 # To connect using a non-root user (and elevate to root with sudo later),
@@ -6,4 +5,6 @@
 #
 # For improved Ansible performance, SSH pipelining is enabled by default (`ansible_ssh_pipelining=yes`).
 # If this causes SSH connection troubles, feel free to disable it.
+
+[matrix-servers]
 matrix.<your-domain> ansible_host=<your-server's external IP address> ansible_ssh_user=root ansible_ssh_pipelining=yes