retrieval: Cleanup some comments

node/impl/client/client.go

@@ -1058,9 +1058,6 @@ func parseDagSpec(ctx context.Context, root cid.Cid, dsp []api.DagSpec, ds forma
 
 						if p.LastBlock.Link == nil {
 							// this is likely the root node that we've matched here
-							// todo: is this a correct assumption
-							// todo: is the n ipld.Node above the node we want as the (sub)root?
-							// todo: how to go from ipld.Node to a cid?
 							newRoot = root
 							return errHalt
 						}