[ChunJun连接器][Mysql Source] connection jdbcUrl的样例和文字描述不符

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### Description

[ChunJun连接器][Mysql Source] connection jdbcUrl的样例和文字描述不符。样例jdbcUrl是List
`"connection": [{
"jdbcUrl": ["jdbc:mysql://0.0.0.1:3306/database?useSSL=false"],
"table": ["table"],
"schema":"public"
}]`
文字说明jdbcUrl应该是string类型

### Documentation Links

https://dtstack.github.io/chunjun/documents/zh/ChunJun%E8%BF%9E%E6%8E%A5%E5%99%A8@mysql@mysql-source?lang=zh#%E5%9B%9B%E3%80%81%E5%8F%82%E6%95%B0%E8%AF%B4%E6%98%8E

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