Update Product properties to attributes

[okiuim]

Corrected outdated information on Product properties. Changed the page to reflect the Attribute model.

[arnolanglade]

@okiuim Can you squash your commit ?

[okiuim]

Sorry, goes beyond my skills. Seems to be mergeable though, so if you will, I will learn to squash things later on ;)

[diimpp]

@okiuim Did you learn it? :) Should I squash them in your stead?

[okiuim]

@diimpp Please do :) Promise to learn sometime

[pjedrzejewski]

@diimpp That would be awesome, thank you! 👍