wp-admin/includes/class-wp-screen.php:695Adds a sidebar to the contextual help for the screen.
$contentstring public function set_help_sidebar( $content ) { $this->_help_sidebar = $content; }Introduced in 3.3.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/class-wp-screen.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.