Remove extra words in demo/index.html.

demo/index.html

@@ -18,7 +18,7 @@
 		<h1>AngularJS Environment Plugin</h1>
 		<p>Let's see if it works</p>
 		<hr>
-		<h3>The current environment is <span style="color: blue;">{{environment}}</span> and this are the their vars</h3>
+		<h3>The current environment is <span style="color: blue;">{{environment}}</span> and this is their vars</h3>
 		<ul>
 			<li ng-repeat="(k, v) in vars"><code>{{k}} —→ {{v}}</code></li>
 		</ul>