fixing single node install content per Denise's feedback

layouts/shortcodes/requirements_software.html

@@ -1,9 +1,7 @@
 <div>
-	<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>
+	
+			<p>A supported version of <a href="https://www.docker.com/">Docker</a> is required.</p>
+			<p>Supported Versions:</p>
 			<ul>
 				<li><code>1.12.6</code></li>
 				<li><code>1.13.1</code></li>
@@ -11,6 +9,5 @@
 			</ul>
 			<br/>
 			<p><a href="https://docs.docker.com/install/">Docker Documentation: Installation Instructions</a></p>
-		</li>
-	</ul>
+	
 </div>