chore fixed (#897)

* chore fixed

common/log/log.go

@@ -34,7 +34,7 @@ func Record(msg Message) {
 
 var logHandler syncHandler
 
-// RegisterHandler register a new handler as current log handler. Previous registered handler will be discarded.
+// RegisterHandler registers a new handler as current log handler. Previous registered handler will be discarded.
 func RegisterHandler(handler Handler) {
 	if handler == nil {
 		panic("Log handler is nil")