byKeyValue does not exist for associative arrays

[Bayan Rafeh via Digitalmars-d-learn]

Apparently byKeyValue does not exist for associative arrays, 
should it?

void main() {
     int[string] a;
     a.byKeyValue(); //Error: byKeyValue doesn't exist.
}

If it shouldn't could someone remove it from the documentation?

http://dlang.org/hash-map.html