added order definition

docs/timeline/index.html

@@ -425,10 +425,18 @@ <h3 id="groups">Groups</h3>
         example <code>"color: red; background-color: pink;"</code>.
       </td>
     </tr>
+    <tr>
+      <td>order</td>
+      <td>number</td>
+      <td>no</td>
+      <td>Order of the group in the list.
+        By default, groups are ordered by first-come, first-show.
+      </td>
+    </tr>
     <tr>
       <td>subgroupOrder</td>
       <td>String or Function</td>
-      <td>none</td>
+      <td>no</td>
       <td>Order the subgroups by a field name or custom sort function.
         By default, groups are ordered by first-come, first-show.
       </td>
@@ -446,7 +454,7 @@ <h3 id="groups">Groups</h3>
     <tr>
       <td>title</td>
       <td>String</td>
-      <td>none</td>
+      <td>no</td>
       <td>A title for the group, displayed when holding the mouse on the groups label.
         The title can only contain plain text.
       </td>