WordPress at a glance
function is not described

do_activate_header() WP 3.0.0

Adds an action hook specific to this page.

Fires on 'wp_head'.

Hooks in function
Return

Nothing (null).

Usage

do_activate_header();

Code of do activate header: wp-activate.php VER 5.1.1

<?php
function do_activate_header() {
	/**
	 * Fires before the Site Activation page is loaded.
	 *
	 * Fires on the {@see 'wp_head'} action.
	 *
	 * @since 3.0.0
	 */
	do_action( 'activate_wp_head' );
}