update gaudi version mapping table for v3.1 (#2030)

Signed-off-by: Huang, Tai <[email protected]>
Co-authored-by: chen, suyue <[email protected]>

Author: thuang6

docs/source/3x/gaudi_version_map.md

@@ -13,4 +13,10 @@
             <td>v1.17</td>
         </tr>
     </tbody>
+    <tbody>
+        <tr>
+            <td>v3.1</td>
+            <td>v1.18</td>
+        </tr>
+    </tbody>
 </table>