pkg/tz(ticdc): better log

pkg/sink/mysql/config.go

@@ -334,7 +334,9 @@ func getSafeMode(values url.Values, safeMode *bool) error {
 func getTimezone(ctxWithTimezone context.Context, values url.Values, timezone *string) error {
  const pleaseSpecifyTimezone = "We recommend that you specify the time-zone explicitly. " +
  "Please make sure that the timezone of the TiCDC server, " +
- "sink-uri and the downstream database are consistent."
+ "sink-uri and the downstream database are consistent. " +
+ "If the downstream database does not load the timezone information, " +
+ "you can refer to https://dev.mysql.com/doc/refman/8.0/en/mysql-tzinfo-to-sql.html."
  serverTimezone := contextutil.TimezoneFromCtx(ctxWithTimezone)
  if _, ok := values["time-zone"]; !ok {
  // If time-zone is not specified, use the timezone of the server.