typo fixed

example/conversion_use_case.cpp

@@ -44,7 +44,7 @@ int main()
 
   for (auto &out_rec : recs)  // write each record
   {
-    out_rec.balance = boost::endian::native_to_big(rec.balance);  // reverse if needed
+    out_rec.balance = boost::endian::native_to_big(out_rec.balance);  // reverse if needed
     out.write((const char*)&out_rec, sizeof(out_rec));
   }