IVGCVSW-6262 Add Reduce Prod to documentation

Signed-off-by: Teresa Charlin <teresa.charlinreyes@arm.com>
Change-Id: Icbb7115e4fe0c72d357ccb215430298e723a2253
diff --git a/docs/05_operator_list.dox b/docs/05_operator_list.dox
index 1f4b43f..cbad7e8 100644
--- a/docs/05_operator_list.dox
+++ b/docs/05_operator_list.dox
@@ -2452,6 +2452,7 @@
        <li>ANEURALNETWORKS_REDUCE_MAX
        <li>ANEURALNETWORKS_REDUCE_MIN
        <li>ANEURALNETWORKS_REDUCE_SUM
+       <li>ANEURALNETWORKS_REDUCE_PROD
       </ul>
    <td>CpuRef
      <td>