update doc

doc/XXL-JOB官方文档.md

@@ -904,12 +904,13 @@ XXL-JOB是一个分布式任务调度平台，其核心设计目标是开发迅
 spring.datasource.url=jdbc:mysql://127.0.0.1:3306/xxl_job?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&serverTimezone=Asia/Shanghai
 spring.datasource.username=root
 spring.datasource.password=root_pwd
-spring.datasource.driver-class-name=com.mysql.jdbc.Driver
+spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
 
 ### 报警邮箱
 spring.mail.host=smtp.qq.com
 spring.mail.port=25
 spring.mail.username=xxx@qq.com
+spring.mail.from=xxx@qq.com
 spring.mail.password=xxx
 spring.mail.properties.mail.smtp.auth=true
 spring.mail.properties.mail.smtp.starttls.enable=true