Docs: Correct the note about the CORE_UPGRADE_SKIP_NEW_BUNDLED cons…

…tant in `$_new_bundled_files` global description.

In order to tell WordPress not to install new bundled themes on update, `CORE_UPGRADE_SKIP_NEW_BUNDLED` should be set to `true`, as the name suggests, not `false`.

Follow-up to [39064].

Props tomgreer, knutsp, crdunst.
See #49056.

git-svn-id: https://develop.svn.wordpress.org/trunk@47007 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/update-core.php

@@ -807,7 +807,7 @@
  * @since 4.7.0 New themes were not automatically installed for 4.4-4.6 on
  *              upgrade. New themes are now installed again. To disable new
  *              themes from being installed on upgrade, explicitly define
- *              CORE_UPGRADE_SKIP_NEW_BUNDLED as false.
+ *              CORE_UPGRADE_SKIP_NEW_BUNDLED as true.
  * @global array $_new_bundled_files
  * @var array
  * @name $_new_bundled_files