Address cpp-docs 3378 (#3782)

Author: Colin Robertson

docs/error-messages/compiler-warnings/compiler-warning-level-4-c4702.md

@@ -1,22 +1,22 @@
 ---
 description: "Learn more about: Compiler Warning (level 4) C4702"
 title: "Compiler Warning (level 4) C4702"
-ms.date: "11/04/2016"
+ms.date: 09/20/2021
 f1_keywords: ["C4702"]
 helpviewer_keywords: ["C4702"]
 ms.assetid: d8198c1e-8762-42a6-9e6b-cb568b7a1686
 ---
 # Compiler Warning (level 4) C4702
 
-unreachable code
+> unreachable code
 
-This warning is the result of compiler conformance work that was done for Visual Studio .NET 2003: unreachable code. When the compiler (back end) detects unreachable code, it will generate C4702, a level 4 warning.
+When the compiler back end detects unreachable code, it generates C4702 as a level 4 warning.
 
-For code that is valid in both the Visual Studio .NET 2003 and Visual Studio .NET versions of Visual C++, remove the unreachable code or assure that all source code is reachable by some flow of execution.
+To address this warning, remove the unreachable code or assure that all source code is reachable by some flow of execution.
 
 ## Examples
 
-The following sample generates C4702.
+The following sample generates C4702. To fix it, remove the unreachable code.
 
 ```cpp
 // C4702.cpp
@@ -29,11 +29,11 @@ int main() {
 }
 ```
 
-When compiling with **/GX**, **/EHc**, **/EHsc**, or **/EHac** and using extern C functions, code can become unreachable because extern C functions are assumed to not throw, thus the catch block isn't reachable.  If you feel that this warning is not valid because a function can throw, compile with **/EHa** or **/EHs**, depending on the exception thrown.
+Error C4702 can occur in some versions of the compiler when you compile using the **`/GX`**, **`/EHc`**, **`/EHsc`**, or **`/EHac`** options, and use `extern "C"` functions. Because the compiler assumes `extern "C"` functions don't throw, the catch block isn't reachable. If you feel that this warning isn't valid because a function can throw, compile with **`/EHa`** or **`/EHs`**, depending on the exception thrown.
 
-For more information, see [/EH (Exception Handling Model)](../../build/reference/eh-exception-handling-model.md) for more information.
+For more information, see [`/EH` (Exception Handling Model)](../../build/reference/eh-exception-handling-model.md).
 
-The following sample generates C4702.
+The following sample generates C4702:
 
 ```cpp
 // C4702b.cpp