Suggest ansible_ssh_pipelining=yes for hosts

examples/hosts

@@ -1,2 +1,9 @@
 [matrix-servers]
-matrix.<your-domain> ansible_host=<your-server's external IP address> ansible_ssh_user=root
+# 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),
+# replace `ansible_ssh_user=root` with something like this: `ansible_ssh_user=username become=true become_user=root`
+#
+# 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.<your-domain> ansible_host=<your-server's external IP address> ansible_ssh_user=root ansible_ssh_pipelining=yes