Tests: Correct two @covers annotations to use the recommended pattern.

When global functions are covered, they need to be prefixed with `::` (double colon) to distinguish them from class name.

Reference: [https://docs.phpunit.de/en/10.3/annotations.html#covers PHPUnit Manual: @covers annotation].

Follow-up to [48848], [49305], [53741], [56296].

Props ayeshrajans.
Fixes #59069.

git-svn-id: https://develop.svn.wordpress.org/trunk@56384 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/rest-api/rest-navigation-fallback-controller.php

@@ -153,7 +153,7 @@ class WP_REST_Navigation_Fallback_Controller_Test extends WP_Test_REST_Controlle
 	 *
 	 * @ticket 58557
 	 *
-	 * @covers wp_add_fields_to_navigation_fallback_embedded_links
+	 * @covers ::wp_add_fields_to_navigation_fallback_embedded_links
 	 *
 	 * @since 6.3.0 Added Navigation Fallbacks endpoint.
 	 */

tests/phpunit/tests/theme/customHeader.php

@@ -88,7 +88,7 @@ class Tests_Theme_CustomHeader extends WP_UnitTestCase {
 	 *
 	 * @ticket 56180
 	 *
-	 * @covers get_header_image
+	 * @covers ::get_header_image
 	 *
 	 * @dataProvider data_filter_header_image
 	 *