Document $wp_registered_sidebars global in wp_map_sidebars_widgets()

[mukesh27]

global $wp_registered_sidebars is used but it is not mentioned in the documentation of the wp_map_sidebars_widgets() function.

[mukesh27]

updated patch

[mukesh27]

Document $user_id global in wp_admin_bar_edit_menu()

[pento]

In 44585:

Docs: Improve documentation of the $wp_registered_sidebars` global.

Props mukesh27.
Fixes #43448.

[pento]

In 44586:

Docs: Improve the docblock of wp_admin_bar_edit_menu().

What age were you when you learned that there's a $user_id global, as well as $user_ID global? I was today years old.

Props pento, mukesh27.
Fixes #43448.