Fix plugin file reload comment (#4665)

Signed-off-by: Sven Nebel <nebel.sven@gmail.com>

plugin/auto/zone.go

@@ -41,7 +41,7 @@ func (z *Zones) Zones(name string) *file.Zone {
 	return zo
 }
 
-// Add adds a new zone into z. If zo.NoReload is false, the
+// Add adds a new zone into z. If z.ReloadInterval is not zero, the
 // reload goroutine is started.
 func (z *Zones) Add(zo *file.Zone, name string, t *transfer.Transfer) {
 	z.Lock()

plugin/file/reload.go

@@ -7,7 +7,7 @@ import (
 	"github.com/coredns/coredns/plugin/transfer"
 )
 
-// Reload reloads a zone when it is changed on disk. If z.NoReload is true, no reloading will be done.
+// Reload reloads a zone when it is changed on disk. If z.ReloadInterval is zero, no reloading will be done.
 func (z *Zone) Reload(t *transfer.Transfer) error {
 	if z.ReloadInterval == 0 {
 		return nil