"final" as function parameter attribute?

[Johan Engelen via Digitalmars-d-learn]

On http://dlang.org/function.html, I read that "final" is a valid 
attribute/storage class for function parameters:

InOutX:
    auto
    TypeCtor
    final  <-- ??
    in
    lazy
    out
    ref
    scope
This looks like a documentation error, but perhaps it's not. I 
hope someone can explain what it means, or confirm that it is an 
error. If it really is a valid storage class for parameters, 
please help document it here: 
http://dlang.org/function.html#parameters

Thanks!

-Johan