code: func Docs(dsl func()) {
  	docs := new(design.DocsDefinition)
  	if !dslengine.Execute(dsl, docs) {
  		return
  	}
  
  	switch def := dslengine.CurrentDefinition().(type) {
  	case *design.APIDefinition:
  		def.Docs = docs
  	case *design.ActionDefinition:
  		def.Docs = docs
  	case *design.FileServerDefinition:
  		def.Docs = docs
  	default:
  		dslengine.IncompatibleDSL()
  	}
  }
docs: // Docs can be used in: API, Action, Files
  //
  // Docs provides external documentation pointers.