Autoloader: Mention how to load grammars from URLs (#3218)

plugins/autoloader/index.html

@@ -36,11 +36,13 @@ <h1>How to use</h1>
 
 	<p>
 		The plugin will automatically handle missing grammars and load them for you.
-		To do this, you need to provide it with a directory of all the grammars you want.
+		To do this, you need to provide a URL to a directory of all the grammars you want.
+		This can be the path to a local directory with all grammars or a CDN URL.
 	</p>
 	<p>
 		You can download all the available grammars by clicking on the following link: <button class="download-grammars" type="button">download all grammars</button>.<br />
 		Alternatively, you can also clone the GitHub repo and take the <code>components</code> folder from there.
+		Read our <a href="index.html#basic-usage-cdn">usage section</a> to use a CDN.
 	</p>
 	<p>
 		You can then download Prism core and any plugins from the <a href="download.html">Download</a> page, without checking any languages (or just check the languages you want to load by default, e.g. if you're using a language a lot, then you probably want to save the extra HTTP request).
@@ -58,6 +60,10 @@ <h2>Specifying the grammars path</h2>
 
 	<pre><code>Prism.plugins.autoloader.languages_path = 'path/to/grammars/';</code></pre>
 
+	<p>
+		<em>Note:</em> Autoloader is pretty good at guessing this path. You most likely won't have to change this path.
+	</p>
+
 	<h2>Using development versions</h2>
 
 	<p>