Clarify comment

encoder.go

@@ -24,7 +24,7 @@ func NewEncoder(w io.Writer) *Encoder {
 // Encode writes db to e's internal writer
 func (e *Encoder) Encode(db *Database) error {
 	// Unlock protected entries ensuring that we have them prepared in the order that is matching
-	// the xml marshalling order
+	// the xml unmarshalling order
 	err := db.UnlockProtectedEntries()
 	if err != nil {
 		return err