Copy to clipboard: Fixed typo (#1869)

This fixes a small type in the webpage of the copy to clipboard plugin.

plugins/copy-to-clipboard/index.html

@@ -28,7 +28,7 @@ <h1>How to use</h1>
 	<p>In addition to including the plugin file with your PrismJS build, ensure <a href="https://clipboardjs.com/">Clipboard.js</a> is loaded before the plugin.</p>
 
 	<p>The simplest way to include Clipboard.js is to use any of the
-		<a href="https://github.com/zenorocha/clipboard.js/wiki/CDN-Providers">recommended CDNs</a>. If you're using Browserify, Clipboard.js will be loaded auotmatically
+		<a href="https://github.com/zenorocha/clipboard.js/wiki/CDN-Providers">recommended CDNs</a>. If you're using Browserify, Clipboard.js will be loaded automatically
 		if it's included in your <code>package.json</code>.
 		If you don't load Clipboard.js yourself, the plugin will load it from a CDN for you.</p>