website: added more copy to homepage

/cc @pearkes @armon - I think the spacing was weird, so I added
another couple sentences to help fill it out.

Author: mitchellh

website/source/index.html.erb

@@ -22,9 +22,11 @@
 	<div class="container">
 		<div class="row">
 			<div class="col-lg-7 col-md-7 col-sm-12">
-				<h2 class="feature-t">Launch Infrastructure from code</h2>
+				<h2 class="feature-t">Infrastructure as code</h2>
 				<p>Terraform provides a common configuration to launch infrastructure &mdash;
-					from physical and virtual servers to email and DNS providers.</p>
+				from physical and virtual servers to email and DNS providers. Once launched,
+				Terraform safely and efficiently changes infrastructure as the configuration
+				is evolved.</p>
 				<p>Simple file based configuration gives you a single view
 					of your entire infrastructure.</p>
 			</div>
@@ -47,9 +49,11 @@
 				</div>
 			</div>
 			<div class="col-lg-7 col-md-7 col-sm-12">
-				<h2 class="feature-t">Combine Mulitple Providers</h2>
-				<p>Terraform allows you to effortlessly combine high level system
-					providers with your own or with each other. Built-in dependency resolution means
+				<h2 class="feature-t">Combine Multiple Providers</h2>
+				<p>Terraform allows you to effortlessly combine high-level system
+				providers with your own or with each other. Launch a server from
+				one cloud provider, add a DNS entry with it's IP with a different
+				provider. Built-in dependency resolution means
 					things happen in the right order.</p>
 			</div>
 		</div>