Update c6031.md

Adding additional documentation on the use of std::ignore to silence the C6031 warning.

Author: JordanMaples

docs/code-quality/c6031.md

@@ -83,6 +83,20 @@ void test_f()
 }
 ```
 
+In cases where it is necessary to ignore the return value of a function, assign the returned value to `std::ignore`. Assigning to `std::ignore` clearly indicates developer intent and helps in future code maintenance. 
+
+```cpp
+#include <tuple>
+#include <ctime>
+#include <stdio.h>
+void f()
+{
+    std::srand(static_cast(std::time(nullptr))); // set initial seed value to system clock
+    std::ignore = std::rand(); // Discard the first result as the few random results are always small.
+    // ... 
+}
+```
+
 ## See also
 
 [fopen_s, _wfopen_s](../c-runtime-library/reference/fopen-s-wfopen-s.md)\