fix some comments (#6052)

Signed-off-by: cui fliter <imcusg@gmail.com>

plugin/file/wildcard.go

@@ -2,7 +2,7 @@ package file
 
 import "github.com/miekg/dns"
 
-// replaceWithWildcard replaces the left most label with '*'.
+// replaceWithAsteriskLabel replaces the left most label with '*'.
 func replaceWithAsteriskLabel(qname string) (wildcard string) {
 	i, shot := dns.NextLabel(qname, 0)
 	if shot {

plugin/kubernetes/controller.go

@@ -605,7 +605,7 @@ func (dns *dnsControl) detectChanges(oldObj, newObj interface{}) {
 			dns.updateModified()
 		}
 		if emod {
-			dns.updateExtModifed()
+			dns.updateExtModified()
 		}
 	case *object.Pod:
 		dns.updateModified()
@@ -749,7 +749,7 @@ func (dns *dnsControl) updateModified() {
 }
 
 // updateExtModified set dns.extModified to the current time.
-func (dns *dnsControl) updateExtModifed() {
+func (dns *dnsControl) updateExtModified() {
 	unix := time.Now().Unix()
 	atomic.StoreInt64(&dns.extModified, unix)
 }

plugin/pkg/proxy/persistent.go

@@ -42,7 +42,7 @@ func newTransport(addr string) *Transport {
 	return t
 }
 
-// connManagers manages the persistent connection cache for UDP and TCP.
+// connManager manages the persistent connection cache for UDP and TCP.
 func (t *Transport) connManager() {
 	ticker := time.NewTicker(defaultExpire)
 	defer ticker.Stop()