Update kafka09Source.md

Author: yangsishu

docs/kafka09Source.md

@@ -1,5 +1,7 @@
 ## 1.格式：
 ```
+数据现在支持json格式{"xx":"bb","cc":"dd"}
+
 CREATE TABLE tableName(
     colName colType,
     ...
@@ -55,4 +57,4 @@ CREATE TABLE MyTable(
     topic ='nbTest1',
     parallelism ='1'
  );
-```
+```