docs: suggest to use ||| for readability

[ghostsquad]

might be useful to suggest to use ||| syntax for readability of the description.

{
  '#array': d.fn(
    |||
      `array` takes a single argument of any type.
      If it is an array, it returns it, otherwise it is wrapped in an array.
    |||,
    [d.arg('x', d.T.any)]),
  array(x):: (if std.type(x) == "array" then x else [x]),
}