update MD by dispatch event pingcap/docs release-7.1

Author: github-actions

markdown-pages/en/tidb/release-7.1/ticdc/ticdc-ddl.md

@@ -137,6 +137,7 @@ Assume that the configuration file of your changefeed is as follows:
 [filter]
 rules = ['test.t*']
 
+[[filter.event-filters]]
 matcher = ["test.t1"] # This filter rule applies only to the t1 table in the test database.
 ignore-event = ["create table", "drop table", "truncate table", "rename table"]
 ```