Update metadata in <thread> functions reference

Author: Rageking8

docs/standard-library/thread-functions.md

@@ -1,9 +1,8 @@
 ---
-description: "Learn more about: <thread> functions"
 title: "<thread> functions"
-ms.date: "11/04/2016"
+description: "Learn more about: <thread> functions"
+ms.date: 11/04/2016
 f1_keywords: ["thread/std::get_id", "thread/std::sleep_for", "thread/std::sleep_until", "thread/std::swap", "thread/std::yield"]
-ms.assetid: bb1aa1ef-fe3f-4e2c-8b6e-e22dbf2f5a19
 helpviewer_keywords: ["std::get_id [C++]", "std::sleep_for [C++]", "std::sleep_until [C++]", "std::swap [C++]", "std::yield [C++]"]
 ---
 # `<thread>` functions