Document $wp global in redirect_canonical()

[afzalmultani]

global $wp is used but it is not mentioned in the documentation of the function.

[afzalmultani]

function redirect_canonical in canonical.php

[afzalmultani]

global wp_post_statuses is used in make_auto_draft_status_previewable() function but it is not mentioned in the documentation of the function.

[afzalmultani]

global wpdb is used in get_network_ids() function but it is not mentioned in the documentation of the function.

[SergeyBiryukov]

In 41003:

Docs: Add a @global entry for $wp in redirect_canonical().

Props afzalmultani.
See #41238.

[SergeyBiryukov]

In 41004:

Docs: Add a @global entry for $wp_post_statuses in WP_Customize_Nav_Menus::make_auto_draft_status_previewable().

Props afzalmultani.
See #41238.

[SergeyBiryukov]

In 41005:

Docs: Add a @global entry for $wpdb in WP_Network_Query::get_network_ids().

Props afzalmultani.
Fixes #41238.

[SergeyBiryukov]

#41310 was marked as a duplicate.