Tips on Customizing WP Document Revisions

How to Hide WP Document Revisions Admin Menus

function plt_hide_wp_document_revisions_menus() {
	//Hide "Documents".
	remove_menu_page('edit.php?post_type=document');
	//Hide "Documents → All Documents".
	remove_submenu_page('edit.php?post_type=document', 'edit.php?post_type=document');
	//Hide "Documents → Add New Document".
	remove_submenu_page('edit.php?post_type=document', 'post-new.php?post_type=document');
	//Hide "Documents → Workflow States".
	remove_submenu_page('edit.php?post_type=document', 'edit-tags.php?taxonomy=workflow_state&post_type=document');
	//Hide "Documents → Validate Structure".
	remove_submenu_page('edit.php?post_type=document', 'wpdr_validate');
}

add_action('admin_menu', 'plt_hide_wp_document_revisions_menus', 21);

Where do I put this code?

How to Hide the "Recently Revised Documents" Dashboard Widget

function plt_hide_wp_document_revisions_dashboard_widgets() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Remove the "Recently Revised Documents" widget.
	remove_meta_box('wpdr_dashboard', 'dashboard', 'normal');
}

add_action('wp_dashboard_setup', 'plt_hide_wp_document_revisions_dashboard_widgets', 20);