Updated C28208

Updated to new format, added more information, added an example

Author: MugBergerFries

docs/code-quality/c28208.md

@@ -1,14 +1,42 @@
 ---
 description: "Learn more about: C28208"
 title: C28208
-ms.date: 11/04/2016
+ms.date: 08/30/2022
 ms.topic: reference
-f1_keywords: ["C28208"]
+f1_keywords: ["C28208", "FUNCTION_TYPE_REDECLARATION", "__WARNING_FUNCTION_TYPE_REDECLARATION"]
 helpviewer_keywords: ["C28208"]
 ms.assetid: e9a8ce37-3b05-4202-b078-5570ae496d1d
 ---
-# C28208
+# Warning C28208
 
-> warning C28208: Function \<function> was previously defined with a different parameter list at \<file>(\<line>). Some analysis tools will yield incorrect results
+> Function `\**function_name*` was previously defined with a different parameter list at `\**file_name*`(`\**line_number*`). Some analysis tools will yield incorrect results
 
-This warning is reported when a function's known definition doesn't match another occurrence.
+## Remarks
+
+This warning will almost always accompany [Compiler Warning (level 1) C4028](/cpp/error-messages/compiler-warnings/compiler-warning-level-1-c4028?view=msvc-170). Both warn of a mismatch between the parameters of a function's declaration and its definition. However, this specific error indicates a more niche case than C4028. C28208 indicates not only that a mismatch exists, but that it also can cause issues with analysis tools. This warning most notably occurs when the mismatch exists between a `typedef` function pointer and the definition of that function. This is demonstrated in the example below.
+
+Code analysis name: FUNCTION_TYPE_REDECLARATION
+
+## Example
+
+The following code will generate C28208. `test_type` takes in a void pointer in its declaration, but `my_test1` takes in an integer pointer instead. `my_test2` remediates this issue by making sure the definition parameter match the declaration parameters.
+
+*From example.h:*
+
+```cpp
+typedef void test_type(void*);
+```
+
+*From example.cpp:*
+
+```cpp
+test_type my_test1;
+test_type my_test2;
+void my_test1(int* x){};  // Will generate C28208
+void my_test2(void* x){};  // Will not generate C28208
+
+int main()
+{
+    // Code
+}
+```