Add --spacing-* to namespace-reference table ( v4 docs ) (#1913)

* Add `--spacing-*` to namespace-reference table

* fix(docs): add `--spacing-*` to actual namespace-reference table

---------

Co-authored-by: Reiha Hosseini <sabamac@Reihas-MacBook-Pro.local>

Author: mrReiha

src/pages/docs/v4-beta.mdx

@@ -1340,6 +1340,7 @@ Since we've dramatically [simplified theme configuration](#simplified-theme-conf
 | ------------------ | -------------------------------------------------------------------------------------- |
 | `--color-*`        | Color utilities like `bg-white`, `text-black`, or `fill-blue-500`                      |
 | `--font-*`         | Font family utilities like `font-sans`                                                 |
+| `--spacing-*`      | Spacing utilities like `mt-2`, `p-4`                                                   |
 | `--text-*`         | Font size utilities like `text-sm`                                                     |
 | `--font-weight-*`  | Font weight utilities like `font-bold`                                                 |
 | `--tracking-*`     | Letter spacing utilities like `tracking-tight`                                         |
@@ -1369,6 +1370,10 @@ Since we've dramatically [simplified theme configuration](#simplified-theme-conf
       <td className='whitespace-nowrap'>`--font-*`</td>
       <td>Font family utilities like <code>font-sans</code></td>
     </tr>
+    <tr>
+      <td className='whitespace-nowrap'>`--spacing-*`</td>
+      <td>Spacing utilities like <code>mt-2</code> or <code>p-4</code></td>
+    </tr>
     <tr>
       <td className='whitespace-nowrap'>`--text-*`</td>
       <td>Font size utilities like <code>text-sm</code></td>