Fix return type

https://bugs.php.net/78593

Author: vrana

reference/mysql_xdevapi/mysql_xdevapi/session/getdefaultschema.xml

@@ -10,12 +10,11 @@
  <refsect1 role="description">
   &reftitle.description;
   <methodsynopsis>
-   <modifier>public</modifier> <type>string</type><methodname>mysql_xdevapi\Session::getDefaultSchema</methodname>
+   <modifier>public</modifier> <type class="union"><type>mysql_xdevapi\Schema</type><type>null</type></type><methodname>mysql_xdevapi\Session::getDefaultSchema</methodname>
    <void />
   </methodsynopsis>
   <para>
-   Retrieve name of the default schema that's typically set in
-   the connection URI.
+   Retrieve the default schema that's typically set in the connection URI.
   </para>
  </refsect1>
 
@@ -27,8 +26,7 @@
  <refsect1 role="returnvalues">
   &reftitle.returnvalues;
   <para>
-   Name of the default schema defined by the connection, or &null; if
-   one was not set.
+   The default schema defined by the connection, or &null; if one was not set.
   </para>
  </refsect1>
 
@@ -43,7 +41,7 @@ $uri = "mysqlx://testuser:testpasswd@localhost:33160/testx?ssl-mode=disabled";
 $session = mysql_xdevapi\getSession($uri);
 
 $schema = $session->getDefaultSchema();
-echo $schema;
+echo $schema->getName();
 ?>
 ]]>
    </programlisting>