remove links to channel9 (#3813)

Co-authored-by: TylerMSFT <[email protected]>

Author: TylerMSFT

docs/c-runtime-library/reference/rand.md

@@ -27,7 +27,7 @@ int rand(void);
 
 The **`rand`** function returns a pseudorandom integer in the range 0 to **`RAND_MAX`** (32767). Use the [`srand`](srand.md) function to seed the pseudorandom-number generator before calling **`rand`**.
 
-The **`rand`** function generates a well-known sequence and isn't appropriate for use as a cryptographic function. For more cryptographically secure random number generation, use [`rand_s`](rand-s.md) or the functions declared in the C++ Standard Library in [`<random>`](../../standard-library/random.md). For information about what's wrong with **`rand`** and how `<random>` addresses these shortcomings, see this video entitled [rand Considered Harmful](https://channel9.msdn.com/Events/GoingNative/2013/rand-Considered-Harmful).
+The **`rand`** function generates a well-known sequence and isn't appropriate for use as a cryptographic function. For more cryptographically secure random number generation, use [`rand_s`](rand-s.md) or the functions declared in the C++ Standard Library in [`<random>`](../../standard-library/random.md).
 
 By default, this function's global state is scoped to the application. To change this, see [Global state in the CRT](../global-state.md).
 

docs/cpp/index.yml

@@ -33,10 +33,6 @@ landingContent:
             url: ../build/vscpp-step-1-create.md
           - text: Create a console calculator in C++
             url: ../get-started/tutorial-console-cpp.md
-      - linkListType: video
-        links:
-          - text: "Learn C++ - A general purpose language and library"
-            url: https://channel9.msdn.com/Series/cplusplus-language-library
       - linkListType: learn
         links:
           - text: Welcome back to C++ - Modern C++

docs/cppcx/wrl/windows-runtime-cpp-template-library-wrl.md

@@ -3,7 +3,6 @@ description: "Learn more about: Windows Runtime C++ Template Library (WRL)"
 title: "Windows Runtime C++ Template Library (WRL)"
 ms.date: "11/04/2016"
 ms.topic: "overview"
-ms.assetid: b915afce-553b-44a7-b8dc-0ab601758eb0
 ms.custom: intro-overview
 ---
 # Windows Runtime C++ Template Library (WRL)
@@ -36,9 +35,6 @@ The Windows Runtime C++ Template Library and C++/CX provide different benefits.
 
 Here are some resources that can help you get working with the Windows Runtime C++ Template Library right away.
 
-[The Windows Runtime Library (WRL)](https://channel9.msdn.com/Events/Windows-Camp/Developing-Windows-8-Metro-style-apps-in-Cpp/The-Windows-Runtime-Library-WRL-)<br/>
-In this Channel 9 video, learn more about how the Windows Runtime C++ Template Library helps you write Universal Windows Platform (UWP) apps and how to author and consume Windows Runtime components.
-
 [How to: Activate and Use a Windows Runtime Component](how-to-activate-and-use-a-windows-runtime-component-using-wrl.md)<br/>
 Shows how to use the Windows Runtime C++ Template Library to initialize the Windows Runtime and activate and use a Windows Runtime component.
 

docs/overview/what-s-new-for-cpp-2017.md

@@ -1,7 +1,7 @@
 ---
 title: "What's new for C++ in Visual Studio 2017"
 description: "The new features and fixes in the Microsoft C/C++ compiler and tools in Visual Studio 2017."
-ms.date: 03/08/2021
+ms.date: 10/04/2021
 ms.technology: "cpp-ide"
 ms.custom: intro-whats-new
 ---
@@ -491,7 +491,7 @@ Visual Studio Graphics Diagnostics tools: You can use them to record and analyze
 
   ![Frame validation.](media/frame-validation.png)
 
-- **Frame Analysis for D3D12:** Use Frame Analysis to analyze draw-call performance with directed "what-if" experiments. Switch to the Frame Analysis tab and run analysis to view the report. For more details, watch the [GoingNative 25: Visual Studio Graphics Frame Analysis](https://channel9.msdn.com/Shows/C9-GoingNative/GoingNative-25-Offline-Analysis-Graphics-Tool) video.
+- **Frame Analysis for D3D12:** Use Frame Analysis to analyze draw-call performance with directed "what-if" experiments. Switch to the Frame Analysis tab and run analysis to view the report.
 
   ![Frame analysis.](media/frame-analysis.png)