Add to f1_keywords and helpviewer_keywords in "Attributes in C++" article

Author: Rageking8

docs/cpp/attributes.md

@@ -1,8 +1,8 @@
 ---
 description: "Learn more about: Attributes in C++"
 title: "Attributes in C++"
-f1_keywords: ["deprecated", "noreturn", "carries_dependency", "fallthrough", "nodiscard", "maybe_unused", "likely", "unlikely", "gsl::suppress", "msvc::intrinsic", "msvc::no_tls_guard"]
-helpviewer_keywords: ["deprecated", "noreturn", "carries_dependency", "fallthrough", "nodiscard", "maybe_unused", "likely", "unlikely", "gsl::suppress", "msvc::intrinsic", "msvc::no_tls_guard"]
+f1_keywords: ["deprecated", "noreturn", "carries_dependency", "fallthrough", "nodiscard", "maybe_unused", "likely", "unlikely", "gsl::suppress", "msvc::flatten", "msvc::forceinline", "msvc::forceinline_calls", "msvc::intrinsic", "msvc::noinline", "msvc::noinline_calls", "msvc::no_tls_guard"]
+helpviewer_keywords: ["deprecated", "noreturn", "carries_dependency", "fallthrough", "nodiscard", "maybe_unused", "likely", "unlikely", "gsl::suppress", "msvc::flatten", "msvc::forceinline", "msvc::forceinline_calls", "msvc::intrinsic", "msvc::noinline", "msvc::noinline_calls", "msvc::no_tls_guard"]
 ms.date: 4/13/2023
 ---