Update bcdivmod.xml Specify the correct return type (#4401)

Author: mmalferov

reference/bc/functions/bcdivmod.xml

@@ -9,7 +9,7 @@
  <refsect1 role="description">
   &reftitle.description;
   <methodsynopsis>
-   <type>string</type><methodname>bcdivmod</methodname>
+   <type>array</type><methodname>bcdivmod</methodname>
    <methodparam><type>string</type><parameter>num1</parameter></methodparam>
    <methodparam><type>string</type><parameter>num2</parameter></methodparam>
    <methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>scale</parameter><initializer>&null;</initializer></methodparam>