Tests: Update docblocks for media type filtering tests to include ticket reference 64046.

Author: ramonjd

tests/phpunit/tests/rest-api/rest-attachments-controller.php

@@ -2672,7 +2672,9 @@ public function test_upload_svg_image() {
 	}
 
 	/**
-	 * @ticket ??????
+	 * Test that the `media_types` parameter filters the response by multiple media types.
+	 *
+	 * @ticket 64046
 	 */
 	public function test_get_items_with_media_types() {
 		$video_id = self::factory()->attachment->create_object(
@@ -2734,7 +2736,7 @@ public function test_get_items_with_media_types() {
 	/**
 	 * Test that the `media_type` parameter overrides the `media_types` parameter.
 	 *
-	 * @ticket ??????
+	 * @ticket 64046
 	 */
 	public function test_get_items_with_media_type_and_media_types() {
 		self::factory()->attachment->create_object(