Modify The Section Archive Title

ot_apollo_filter_archive_title.php

<?php 
/**
 * Remove 'Section:' from Section archive titles.
 *
 * @param string $title The default title to be filtered.
 */
function ot_apollo_filter_archive_title( $title ) {

	if ( is_tax( 'section' ) ) {

		$title = single_term_title( '', false );

	}

	return $title;

}
add_filter( 'get_the_archive_title', 'ot_apollo_filter_archive_title' );