net/dns: remove ref to managerImpl

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>

net/dns/direct.go

@@ -143,7 +143,7 @@ func isResolvedRunning() bool {
 	return err == nil
 }
 
-// directManager is a managerImpl which replaces /etc/resolv.conf with a file
+// directManager is an OSConfigurator which replaces /etc/resolv.conf with a file
 // generated from the given configuration, creating a backup of its old state.
 //
 // This way of configuring DNS is precarious, since it does not react

net/dns/resolved.go

@@ -80,7 +80,7 @@ func isResolvedActive() bool {
 	return false
 }
 
-// resolvedManager uses the systemd-resolved DBus API.
+// resolvedManager is an OSConfigurator which uses the systemd-resolved DBus API.
 type resolvedManager struct {
 	logf     logger.Logf
 	ifidx    int
@@ -105,7 +105,6 @@ func newResolvedManager(logf logger.Logf, interfaceName string) (*resolvedManage
 	}, nil
 }
 
-// Up implements managerImpl.
 func (m *resolvedManager) SetDNS(config OSConfig) error {
 	ctx, cancel := context.WithTimeout(context.Background(), reconfigTimeout)
 	defer cancel()