Fix GH-1437: Missing return type false for apcu_sma_info() in description

Author: cmb69

reference/apcu/functions/apcu-sma-info.xml

@@ -10,7 +10,7 @@
  <refsect1 role="description">
   &reftitle.description;
   <methodsynopsis>
-   <type>array</type><methodname>apcu_sma_info</methodname>
+   <type class="union"><type>array</type><type>false</type></type><methodname>apcu_sma_info</methodname>
    <methodparam choice="opt"><type>bool</type><parameter>limited</parameter><initializer>&false;</initializer></methodparam>
   </methodsynopsis>
   <para>