Topic on Talk:Wikibase/Installation/Advanced configuration

When I'm setting up Wikibase on my MeidaWiki site following the guidance of "Items in a dedicated item namespace" section, update.php complains about duplicate definitions

The notes are as follows

PHP Notice:  Constant WB_NS_ITEM already defined in /x/cpwiki/root/LocalSettings.php on line 247
PHP Notice:  Constant WB_NS_ITEM_TALK already defined in /x/cpwiki/root/LocalSettings.php on line 248
PHP Notice:  Constant WB_NS_PROPERTY already defined in /x/cpwiki/root/LocalSettings.php on line 249
PHP Notice:  Constant WB_NS_PROPERTY_TALK already defined in /x/cpwiki/root/LocalSettings.php on line 250

The content from line 247 are

define( 'WB_NS_ITEM', $baseNs );
define( 'WB_NS_ITEM_TALK', $baseNs + 1 );
define( 'WB_NS_PROPERTY', $baseNs + 2 );
define( 'WB_NS_PROPERTY_TALK', $baseNs + 3 );

Then I removed these definitions in LocalSettings.php, the note is gone. I'm not sure if it's only me or the manual here needs an update. I'm using MW 1.31.0-wmf.8.

I see that the example code has one line

require_once "$IP/extensions/Wikibase/repo/ExampleSettings.php";

which in the end refers to /extensions/Wikibase/repo/config/Wikibase.example.php. It contains definition of those namespeces already, so I don't need to repeat them in LocalSettings.php.