all: fix typo

CHANGELOG.md

@@ -25,7 +25,7 @@ NOTE: Add new changes BELOW THIS COMMENT.
 
 ### Added
 
-- Ability to specify multiple domain specific upstreams per line e.g.
+- Ability to specify multiple domain specific upstreams per line, e.g.
   `[/domain1/../domain2/]upstream1 upstream2 .. upstreamN` ([#4977]).
 
 ### Fixed

internal/dnsforward/http.go

@@ -818,8 +818,8 @@ func (s *Server) handleTestUpstreamDNS(w http.ResponseWriter, r *http.Request) {
 		defer log.OnPanic("dnsforward: checking upstreams")
 
 		res := s.checkDNS(upstreamLine, opts, check)
-		for u, e := range res {
-			m.Store(u, e)
+		for ups, status := range res {
+			m.Store(ups, status)
 		}
 
 		wg.Done()