Fix the test.

test/php/gutenberg-coding-standards/Gutenberg/Tests/Commenting/SinceTagUnitTest.inc

@@ -613,15 +613,15 @@ if ( ! function_exists( 'apply_filters_deprecated' ) ) {
 	}
 }
 
-$some_object = new do_action();
-$some_object = $my_object->do_action();
-$some_object = new do_action_ref_array();
-$some_object = $my_object->do_action_ref_array();
-$some_object = new do_action_deprecated();
-$some_object = $my_object->do_action_deprecated();
-$some_object = new apply_filters();
-$some_object = $my_object->apply_filters();
-$some_object = new apply_filters_ref_array();
-$some_object = $my_object->apply_filters_ref_array();
-$some_object = new apply_filters_deprecated();
-$some_object = $my_object->apply_filters_deprecated();
+$foo = new do_action();
+$foo->do_action();
+$foo = new do_action_ref_array();
+$foo->do_action_ref_array();
+$foo = new do_action_deprecated();
+$foo->do_action_deprecated();
+$foo = new apply_filters();
+$foo->apply_filters();
+$foo = new apply_filters_ref_array();
+$foo->apply_filters_ref_array();
+$foo = new apply_filters_deprecated();
+$foo->apply_filters_deprecated();