Document WALK/WalkList

[JJ]

Changes and additions for this version

Changes:

• Method invoke of WalkList returns a lazy Seq instance now -fe40ee1e

[vrurg]

To start with, method WALK itself isn't documented.

[lizmat]

Aren't these implementation details ?

[JJ]

Well, those are the user-facing changes generated automatically from the release document. It might eventually happen that's an implementation detail, in which case this is going to be really fast.

[coke]

Aren't these implementation details ?

No, WALK and WalkList appear in roast.