Type signature for Pair methods are out of date

[ab5tract]

Problem or new feature

For Pair, the kv, pairs, antipairs, keys, and valuesmethods are all indicated to return aListbut in reality they returnSeq`.

Also, unnecessary parentheses are included in several of the examples, eg my $p = (Raku => "d");

See: https://docs.raku.org/type/Pair

Suggestions

Adjust the documentation to reflect the Seq return values.