Fix C4800 doc per Kate's question (#277)

Author: Colin Robertson

docs/error-messages/compiler-warnings/compiler-warning-level-3-c4800.md

@@ -34,20 +34,25 @@ translation.priority.ht:
   - "zh-cn"
   - "zh-tw"
 ---
-# Compiler Warning (level 3) C4800
-'type' : forcing value to bool 'true' or 'false' (performance warning)  
+# Compiler Warning (level 3) C4800  
 
- This warning is generated when a value that is not `bool` is assigned or coerced into type `bool`. Typically, this message is caused by assigning `int` variables to `bool` variables where the `int` variable contains only values **true** and **false**, and could be redeclared as type `bool`. If you cannot rewrite the expression to use type `bool`, then you can add "`!=0`" to the expression, which gives the expression type `bool`. Casting the expression to type `bool` will not disable the warning, which is by design.  
+> '*type*' : forcing value to bool 'true' or 'false' (performance warning)  
   
- The following sample generates C4800:  
+This warning is generated when a value that is not `bool` is assigned or coerced into type `bool`. Typically, this message is caused by assigning `int` variables to `bool` variables where the `int` variable contains only values **true** and **false**, and could be redeclared as type `bool`. If you cannot rewrite the expression to use type `bool`, then you can add "`!=0`" to the expression, which gives the expression type `bool`. Casting the expression to type `bool` does not disable the warning, which is by design.  
 
-```  
+This warning is no longer generated in Visual Studio 2017.  
+  
+## Example
+  
+ The following sample generates C4800 and shows how to fix it:  
+  
+```cpp  
 // C4800.cpp  
 // compile with: /W3  
 int main() {  
    int i = 0;  
 
-   // try..  
+   // To fix, instead try:  
    // bool i = 0;  
 
    bool j = i;   // C4800