Update compiler-warning-level-4-c4339.md

Author: Rastaban

docs/error-messages/compiler-warnings/compiler-warning-level-4-c4339.md

@@ -9,9 +9,9 @@ helpviewer_keywords: ["C4339"]
 
 > 'type' : use of undefined type detected in WinRT or CLR meta-data - use of this type may lead to a runtime exception
 
-A type was not defined in code that was compiled for Windows Runtime or the common language runtime. Define the type to avoid a possible runtime exception.
+A type wasn't defined in code that was compiled for Windows Runtime or the common language runtime. Define the type to avoid a possible runtime exception.
 
-This warning is off by default. See [Compiler Warnings That Are Off by Default](../../preprocessor/compiler-warnings-that-are-off-by-default.md) for more information.
+This warning is off by default. For more information, see [Compiler Warnings That Are Off by Default](../../preprocessor/compiler-warnings-that-are-off-by-default.md).
 
 The following sample generates C4339 and shows how to fix it: