fix size issue

Author: JeffGarland

examples/unique_resource.cpp

@@ -12,7 +12,7 @@ int main() {
     // Allocate an array
     auto resource_ptr = beman::unique_resource
     (
-       new int[arr_szie], // acquire array resource
+       new int[arr_size], // acquire array resource
        // Cleanup function
        [](int* ptr) { delete[] ptr;
                       std::cout << "Array deleted.\n"; }