Mention ansible_connection=local

examples/hosts

@@ -6,6 +6,9 @@
 #
 # 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.
+#
+# If you're running this Ansible playbook on the same server as the one you're installing to,
+# consider adding an additional `ansible_connection=local` argument below.
 
 [matrix_servers]
 matrix.<your-domain> ansible_host=<your-server's external IP address> ansible_ssh_user=root ansible_ssh_pipelining=yes