Why has the language reference been removed?

[Cleverson Casarin Uliana]

Hi all, I notice that the document called The R5RS standard.html isn't 
any longer available in Chicken 5, as well as other documentation. Those 
documents are very valuable as quick references, especially for 
beginners. Can I use such Chicken 4 docs as learning references even 
though I'm on Chicken 5?

Greetings,
Cleverson