Update tests/phpunit/tests/admin/includes/misc/insertWithMarkers.php

Co-authored-by: Weston Ruter <[email protected]>

Author: pbearne

tests/phpunit/tests/admin/includes/misc/insertWithMarkers.php

@@ -66,7 +66,7 @@ public function test_insert_with_markers( $initial_content, $marker, $insertion,
   *     expected:        string,
   * }>
   */
-	public function data_insert_with_markers() {
+	public function data_insert_with_markers(): array {
 		$wp_comments = array(
 			'# The directives (lines) between "BEGIN %s" and "END %s" are',
 			'# dynamically generated, and should only be modified via WordPress filters.',