Editorial: add enumerated attribute table for method/formmethod

Helps with #9832.

source

@@ -56029,25 +56029,34 @@ form.method === input; // => true</code></pre>
   content attributes are <span data-x="enumerated attribute">enumerated attributes</span> with the
   following keywords and states:</p>
 
-  <ul>
-   <li>The keyword <dfn attr-value for="form/method,button/method"><code
-   data-x="attr-fs-method-GET-keyword">get</code></dfn>, mapping to the state <dfn
-   data-x="attr-fs-method-GET">GET</dfn>, indicating the HTTP GET method.</li>
-
-   <li>The keyword <dfn attr-value for="form/method,button/method"><code
-   data-x="attr-fs-method-POST-keyword">post</code></dfn>, mapping to the state <dfn
-   data-x="attr-fs-method-POST">POST</dfn>, indicating the HTTP POST method.</li>
-
-   <li>The keyword <dfn attr-value for="form/method,button/method"><code
-   data-x="attr-fs-method-dialog-keyword">dialog</code></dfn>, mapping to the state <dfn
-   data-x="attr-fs-method-dialog">dialog</dfn>, indicating that submitting the <code>form</code> is
-   intended to close the <code>dialog</code> box in which the form finds itself, if any, and
-   otherwise not submit.</li>
-  </ul>
+  <table>
+   <thead>
+    <tr>
+     <th>Keyword
+     <th>State
+     <th>Brief description
+   <tbody>
+    <tr>
+     <td><dfn attr-value for="form/method,button/formmethod,input/formmethod"><code
+     data-x="attr-fs-method-GET-keyword">get</code></dfn>
+     <td><dfn data-x="attr-fs-method-GET">GET</dfn>
+     <td>Indicates the <code>form</code> will use the HTTP GET method.
+    <tr>
+     <td><dfn attr-value for="form/method,button/formmethod,input/formmethod"><code
+     data-x="attr-fs-method-POST-keyword">post</code></dfn>
+     <td><dfn data-x="attr-fs-method-POST">POST</dfn>
+     <td>Indicates the <code>form</code> will use the HTTP POST method.
+    <tr>
+     <td><dfn attr-value for="form/method,button/formmethod,input/formmethod"><code
+     data-x="attr-fs-method-dialog-keyword">dialog</code></dfn>
+     <td><dfn data-x="attr-fs-method-dialog">Dialog</dfn>
+     <td>Indicates the <code>form</code> is intended to close the <code>dialog</code> box in which
+     the form finds itself, if any, and otherwise not submit.
+  </table>
 
-  <p>The attribute's <i data-x="missing value default">missing value default</i> and <i
-  data-x="invalid value default">invalid value default</i> are both the <span
-  data-x="attr-fs-method-GET">GET</span> state.</p>
+  <p>The <code data-x="attr-fs-method">method</code> attribute's <i data-x="missing value
+  default">missing value default</i> and <i data-x="invalid value default">invalid value default</i>
+  are both the <span data-x="attr-fs-method-GET">GET</span> state.</p>
 
   <p>The <code data-x="attr-fs-formmethod">formmethod</code> attribute has no <i data-x="missing
   value default">missing value default</i>, and its <i data-x="invalid value default">invalid value