Book 3 Section 12.1 Listing 33: have a typo in the book

[shadow-lr]

url is https://raytracing.github.io/books/RayTracingTheRestOfYourLife.html#cleaninguppdfmanagement/diffuseversusspecular

The correct way to write it should be:

srec.pdf_ptr = make_shared<cosine_pdf>(rec.normal);