p2p/enode: fix asyncfilter comment (#32823)

just finisher the sentence

Signed-off-by: Csaba Kiraly <[email protected]>

Author: cskiraly

p2p/enode/iter.go

@@ -174,7 +174,8 @@ type AsyncFilterFunc func(context.Context, *Node) *Node
 // AsyncFilter creates an iterator which checks nodes in parallel.
 // The 'check' function is called on multiple goroutines to filter each node
 // from the upstream iterator. When check returns nil, the node will be skipped.
-// It can also return a new node to be returned by the iterator instead of the .
+// It can also return a new node to be returned by the iterator instead of the
+// original one.
 func AsyncFilter(it Iterator, check AsyncFilterFunc, workers int) Iterator {
 	f := &asyncFilterIter{
 		it:     ensureSourceIter(it),