Update hoon.hoon
Fix per request to just patch it on master
++ mold
:> normalizing gate
:>
- :> actually a type alias for gate.
- gate
+ :> a gate that accepts any noun, and validates its shape, producing the
+ :> input if it fits or a default value if it doesn't.
+ :>
+ :> examples: * @ud ,[p=time q=?(%a %b)]
+ _|=(* +<)
::
++ pair
:> dual tuple
