Fix an example in the docs index page. (#8)

docs-src/index.md

@@ -58,7 +58,7 @@ import {html, render} from 'lit-html';
 const name="lit-html";
 
 render(html`
-  <h2>This is a my-element>h2>
+  <h2>This is a &lt;my-element&gt;</h2>
   <my-element .name=${name}></my-element>
 `, document.body);
 ```
@@ -66,6 +66,7 @@ render(html`
   </div>
   <div>
 
+<h2>This is a &lt;my-element&gt;</h2>
 <my-element name="lit-html"></my-element>
 
   </div>