Updates metadata docs

app/views/how/metadata.html

@@ -81,21 +81,21 @@ <h2>Metadata reference</h2>
     </tr>
 
     <tr>
-      <td>Title</td>
+      <td><h2>Title</h2></td>
       <td>By default is the text of the first heading in the post or the file’s name.
         You should generally only set this metadata when you want to show a different title for the post or page in your site's menu or on your archives page. It is best practice to either rename the source file or use a heading in the post itself.
         <pre class="metadata-example"><code>Title: Your title here</code></pre>
       </td>
     </tr>
 
     <tr>
-      <td>Comments</td>
+      <td><h2>Comments</h2></td>
       <td>Determines whether comments are enabled on the post or the page. Can be <code>Yes</code> or <code>No</code>. By default is <code>Yes</code> for posts and <code>No</code> for pages. Has no effect if comments are disabled in the site settings.
         <pre class="metadata-example"><code>Comments: No</code></pre>
       </td>
     </tr>
     <tr>
-      <td>Summary</td>
+      <td><h2>Summary</h2></td>
       <td>By default is the text of the first sentence of the first paragraph in the file. Some templates make use of this metadata, others do not.
         <pre class="metadata-example"><code>Summary: A brief summary of the post</code></pre>
 
@@ -110,14 +110,14 @@ <h2>Metadata reference</h2>
         [[={{ }}=]]
     </tr>
     <tr>
-      <td>Search</td>
+      <td><h2>Search</h2></td>
       <td>Determines whether a post is included in your site’s search results. Can be <code>Yes</code> or <code>No</code>. By default is <code>Yes</code> for posts and <code>No</code> for pages.
         <pre class="metadata-example"><code>Search: No</code></pre>
       </td>
     </tr>
     </tr>
     <tr>
-      <td>Tags</td>
+      <td><h2>Tags</h2></td>
       <td>Use tags to connect posts with similar subjects. Specify tags in the file’s metadata or in its <a href="#set-tags-using-your-folder">path</a>. Here’s an example post with two tags in its metadata:</p>
 <pre class="metadata-example"><code>Tags: Getting started, Documentation</code></pre>
 
@@ -156,23 +156,23 @@ <h2>Metadata reference</h2>
       </td>
     </tr>
     <tr>
-      <td>Thumbnail</td>
+      <td><h2>Thumbnail</h2></td>
       <td>By default is the first image or video thumbnail in the post with both a height and width greater than 64 pixels. You can specify a URL, or a path to an image in your site’s folder.</td>
     </tr>
     <tr>
-      <td>Draft</td>
+      <td><h2>Draft</h2></td>
       <td>Determines whether a file becomes a draft. Can be ’Yes’ or ’No’. By default is ’No’ unless the file is inside a folder called ’Drafts’.</td>
     </tr>
     <tr>
-      <td>Page</td>
+      <td><h2>Page</h2></td>
       <td>Determines whether a file becomes a page or a post. Can be ’Yes’ or ’No’. By default is ’No’ unless the file is inside a folder called ’Pages’.</td>
     </tr>
     <tr>
-      <td>Menu</td>
+      <td><h2>Menu</h2></td>
       <td>Determines whether a file appears on your site’s menu. Can be ’Yes’ or ’No’. By default is ’Yes’ for pages and ’No’ for posts.</td>
     </tr>
     <tr>
-      <td>Slug</td>
+      <td><h2>Slug</h2></td>
       <td>Used to generate the URL for a post or page as part of your site's <a href="/how/configure/link-format">link format</a> setting.
 
       </td>