REST API: Combine array and object cases in WP_REST_Meta_Fields::get_default_for_type() to remove duplicated line.

Add missing description for `$type` parameter.

Props itowhid06, dkarfa.
Fixes #48169.

git-svn-id: https://develop.svn.wordpress.org/trunk@46346 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/rest-api/fields/class-wp-rest-meta-fields.php

@@ -563,7 +563,7 @@ abstract class WP_REST_Meta_Fields {
 	 *
 	 * @since 5.3.0
 	 *
-	 * @param string $type
+	 * @param string $type The schema type.
 	 * @return mixed
 	 */
 	protected function get_default_for_type( $type ) {
@@ -577,7 +577,6 @@ abstract class WP_REST_Meta_Fields {
 			case 'number':
 				return 0.0;
 			case 'array':
-				return array();
 			case 'object':
 				return array();
 			default: