update SDK version required

Author: TylerMSFT

docs/c-language/alignment-c.md

@@ -57,7 +57,7 @@ typedef struct
 {
     int value; // aligns on a 4-byte boundary. There will be 28 bytes of padding between value and alignas
     alignas(32) char alignedMemory[32]; // assuming a 32 byte friendly cache alignment
-} cacheFriendly; // this struct will be 32-byte aligned because alignedMemory is 32-byte alligned and is the largest alignment specified in the struct
+} cacheFriendly; // this struct will be 32-byte aligned because alignedMemory is 32-byte aligned and is the largest alignment specified in the struct
 
 int main()
 {
@@ -125,7 +125,7 @@ int main()
 
 [`/std:c11`](../build/reference/std-specify-language-standard-version.md) or later is required.
 
-Requires Windows SDK 10.0.20201.0 or later. Windows SDK 10.0.20348.0 (version 2104) or later is recommended. You can download the latest SDK from the [Windows 10 SDK](https://developer.microsoft.com/windows/downloads/windows-10-sdk/) page. For more information, and instructions on how to install and use the SDK for C development, see [Install C11 and C17 support in Visual Studio](../overview/install-c17-support.md).
+Windows SDK 10.0.20348.0 (version 2104) or later. You can download the latest SDK from [Windows 10 SDK](https://developer.microsoft.com/windows/downloads/windows-10-sdk/). For more information, and instructions on how to install and use the SDK for C development, see [Install C11 and C17 support in Visual Studio](../overview/install-c17-support.md).
 
 ## See also
 

docs/c-language/generic_selection.md

@@ -1,7 +1,7 @@
 ---
 title: "Generic selection (C11)"
 description: "Describes the C11 _Generic keyword used in the Microsoft Visual C compiler"
-ms.date: "12/9/2020"
+ms.date: "6/28/2021"
 helpviewer_keywords: ["_Generic keyword [C]"]
 ---
 
@@ -70,6 +70,12 @@ Type name: double
 
 ```
 
+## Requirements
+
+[std:c++11](../build/reference/std-specify-language-standard-version.md) or later is required.
+
+Windows SDK 10.0.20348.0 (version 2104) or later. You can download the latest SDK from [Windows 10 SDK](https://developer.microsoft.com/windows/downloads/windows-10-sdk). For more information, and instructions on how to install and use the SDK for C development, see [Install C11 and C17 support in Visual Studio](../overview/install-c17-support.md).
+
 ## See also
 
 [`/std` (Specify Language Standard Version)](../build/reference/std-specify-language-standard-version.md)\

docs/c-runtime-library/tgmath.md

@@ -1,8 +1,8 @@
 ---
 title: "Type-generic math"
-description: "Describes macros in <tgmath.h> that make it easier to write C code that calls the right math function, based on argument type." 
+description: "Describes macros in <tgmath.h> that make it easier to write C code that calls the correct math function by argument type." 
 ms.topic: "conceptual"
-ms.date: "12/10/2020"
+ms.date: "6/28/2021"
 helpviewer_keywords: ["CRT tgmath.h"]
 ---
 
@@ -87,7 +87,7 @@ The following table lists the macros that are available in `<tgmath.h>` and what
 
 [std:c++11](../build/reference/std-specify-language-standard-version.md) or later is required.
 
-Windows SDK version 10.0.20201.0 or later. This is currently an Insider build which you can download from [Windows Insider Preview Downloads](https://www.microsoft.com/software-download/windowsinsiderpreviewSDK). See [C11 and C17: Getting Started](https://devblogs.microsoft.com/cppblog/c11-and-c17-standard-support-arriving-in-msvc/#c11-and-c17-getting-started) for instructions on installing and using this SDK.
+Windows SDK 10.0.20348.0 (version 2104) or later. You can download the latest SDK from [Windows 10 SDK](https://developer.microsoft.com/windows/downloads/windows-10-sdk/). For more information, and instructions on how to install and use the SDK for C development, see [Install C11 and C17 support in Visual Studio](../overview/install-c17-support.md).
 
 ## See also
 

docs/standard-library/cstdalign.md

@@ -1,21 +1,20 @@
 ---
-description: "Learn more about: <cstdalign>"
-title: "<cstdalign>"
-ms.date: "07/11/2019"
+description: "Learn more about: <cstdalign>"
+title: "<cstdalign>"
+ms.date: "6/28/2021"
 f1_keywords: ["<cstdalign>", "__alignas_is_defined", "__alignof_is_defined"]
 helpviewer_keywords: ["cstdalign header", "__alignas_is_defined", "__alignof_is_defined"]
-ms.assetid: 9d570924-d299-4225-9a58-8c4c820f5903
 ---
-# &lt;cstdalign&gt;
+# `<cstdalign>`
 
-In some C++ standard library implementations, this header includes the C standard library header \<stdalign.h>, and adds the associated names to the `std` namespace. Because that header isn't implemented in MSVC, the \<cstdalign> header defines compatibility macros `__alignas_is_defined` and `__alignof_is_defined`.
+In some C++ standard library implementations, this header includes the C standard library header `<stdalign.h>`, and adds the associated names to the `std` namespace. Because that header isn't implemented in MSVC, the `<cstdalign>` header defines compatibility macros `__alignas_is_defined` and `__alignof_is_defined`.
 
 > [!NOTE]
-> Because the \<stdalign.h> header defines macros that are keywords in C++, including it has no effect. The \<stdalign.h> header is deprecated in C++. The \<cstdalign> header is deprecated in C++17 and removed in the draft C++20 standard.
+> Because the `<stdalign.h>` header defines macros that are keywords in C++, including it has no effect. The `<stdalign.h>` header is deprecated in C++. The `<cstdalign>` header is deprecated in C++17 and removed in the draft C++20 standard.
 
 ## Requirements
 
-**Header:** \<cstdalign>
+**Header:** `<cstdalign>`
 
 **Namespace:** std
 

docs/standard-library/ctgmath.md

@@ -1,32 +1,31 @@
 ---
-description: "Learn more about: <ctgmath>"
-title: "<ctgmath>"
-ms.date: "07/11/2019"
+description: "Learn more about: `<ctgmath>`"
+title: "`<ctgmath>`"
+ms.date: "6/28/2021"
 f1_keywords: ["<ctgmath>"]
 helpviewer_keywords: ["ctgmath header"]
-ms.assetid: ff521893-f445-4dc8-a2f6-699185bb7024
 ---
-# &lt;ctgmath&gt;
+# `<ctgmath>`;
 
-In effect, includes the C++ standard library headers \<complex> and \<cmath>, which provide type-generic math macros equivalent to \<tgmath.h>.
+In effect, includes the C++ standard library headers `<complex>` and `<cmath>`, which provide type-generic math macros equivalent to `<tgmath.h>`.
 
 > [!NOTE]
-> The C standard library \<tgmath.h> header isn't included by \<ctgmath>, because it's effectively replaced by the C++ overloads in \<complex> and \<cmath>. That makes the \<ctgmath> header redundant. The \<tgmath.h> header is deprecated in C++. The \<ctgmath> header is deprecated in C++17 and removed in the draft C++20 standard.
+> The C standard library `<tgmath.h>` header isn't included by `<ctgmath>` because it's effectively replaced by the C++ overloads in `<complex>` and `<cmath>`. That makes the `<ctgmath>` header redundant. The `<tgmath.h>` header is deprecated in C++. The `<ctgmath>` header is deprecated in C++17 and removed in the draft C++20 standard.
 
 ## Requirements
 
-**Header:** \<ctgmath>
+**Header:** `<ctgmath>`
 
-**Namespace:** std
+**Namespace:** `std`
 
 ## Remarks
 
-The functionality of the C standard library header \<tgmath.h> is provided by the overloads in \<complex> and \<cmath>.
+The functionality of the C standard library header `<tgmath.h>` is provided by the overloads in `<complex>` and `<cmath>`.
 
 ## See also
 
-[\<complex>](complex.md)\
-[\<cmath>](cmath.md)\
+[`<complex>`](complex.md)\
+[`<cmath>`](cmath.md)\
 [Header files reference](cpp-standard-library-header-files.md)\
 [C++ standard library overview](cpp-standard-library-overview.md)\
 [Thread safety in the C++ standard library](thread-safety-in-the-cpp-standard-library.md)