Clarify that when can't be used with radio/dropdown either

docs/reference/custom-resource-config.mdx

@@ -449,7 +449,7 @@ Items have a `name`, `title`, `type`, and other optional properties.
 <table>
   <tr>
     <th>Description</th>
-    <td><p>The <code>when</code> property denotes items that are displayed on the Admin Console <strong>Config</strong> page only when a condition evaluates to true. When the condition evaluates to false, the item is not displayed.</p><PropertyWhen/><p>The `when` item property has the following requirements and limitations:</p><WhenRequirements/><ul><li><code>when</code> cannot be applied to the items nested under a <code>select_one</code> item. To conditionally show or hide <code>select_one</code> items, apply the <code>when</code> property to the <code>select_one</code> item itself.</li></ul><WhenNote/></td>
+    <td><p>The <code>when</code> property denotes items that are displayed on the Admin Console <strong>Config</strong> page only when a condition evaluates to true. When the condition evaluates to false, the item is not displayed.</p><PropertyWhen/><p>The `when` item property has the following requirements and limitations:</p><WhenRequirements/><ul><li><code>when</code> cannot be applied to the items nested under a <code>radio</code>, <code>dropdown</code> or <code>select_one</code> item. To conditionally show or hide <code>radio</code>, <code>dropdown</code> or <code>select_one</code> items, apply the <code>when</code> property to the item itself.</li></ul><WhenNote/></td>
   </tr>
   <tr>
     <th>Required?</th>