fix per superseb

layouts/shortcodes/requirements_software.html

@@ -3,6 +3,7 @@
 	<ul>
 		<li>
 			<p>Docker</p>
+			<blockquote><strong>Note:</strong>If you are using RancherOS, make sure you switch the Docker engine to a supported version using <code>sudo ros engine switch docker-17.03.2-ce</code></blockquote>
 			<p><strong>Supported Versions</strong></p>
 			<ul>
 				<li><code>1.12.6</code></li>