Fix comment

Engine/source/platform/types.h

@@ -58,7 +58,7 @@ typedef char           UTF8;        ///< Compiler independent 8  bit Unicode enc
 #if defined(_MSC_VER) && defined(__clang__)
 // Clang's MSVC compatibility mode doesn't currently support /Zc:wchar_t-,
 // which we rely on to avoid type conversion errors when calling system
-// APIs when wchar_t is defined as unsigned short.  So, just define UTF16
+// APIs when UTF16 is defined as unsigned short.  So, just define UTF16
 // as wchar_t instead since it's always a 2 byte unsigned on windows anyway.
 typedef wchar_t        UTF16;
 #else