update document

doc/XXL-JOB官方文档.md

 调度中心配置内容说明：
 
     ### 调度中心JDBC链接：链接地址请保持和 2.1章节 所创建的调度数据库的地址一致
-    spring.datasource.url=jdbc:mysql://127.0.0.1:3306/xxl-job?Unicode=true&characterEncoding=UTF-8
+    spring.datasource.url=jdbc:mysql://127.0.0.1:3306/xxl_job?Unicode=true&characterEncoding=UTF-8
     spring.datasource.username=root
     spring.datasource.password=root_pwd
     spring.datasource.driver-class-name=com.mysql.jdbc.Driver
 * 如需自定义 mysql 等配置，可通过 "PARAMS" 指定，参数格式 RAMS="--key=value  --key2=value2" ；
 * 配置项参考文件：/xxl-job/xxl-job-admin/src/main/resources/application.properties
 */
-docker run -e PARAMS="--spring.datasource.url=jdbc:mysql://127.0.0.1:3306/xxl-job?Unicode=true&characterEncoding=UTF-8" -p 8080:8080 -v /tmp:/data/applogs --name xxl-job-admin  -d xuxueli/xxl-job-admin
+docker run -e PARAMS="--spring.datasource.url=jdbc:mysql://127.0.0.1:3306/xxl_job?Unicode=true&characterEncoding=UTF-8" -p 8080:8080 -v /tmp:/data/applogs --name xxl-job-admin  -d xuxueli/xxl-job-admin
 ```
 
 

doc/db/tables_xxl_job.sql

-CREATE database if NOT EXISTS `xxl-job` default character set utf8 collate utf8_general_ci;
-use `xxl-job`;
+CREATE database if NOT EXISTS `xxl_job` default character set utf8 collate utf8_general_ci;
+use `xxl_job`;
 
 
 

xxl-job-admin/src/main/resources/application.properties

 mybatis.mapper-locations=classpath:/mybatis-mapper/*Mapper.xml
 
 ### xxl-job, datasource
-spring.datasource.url=jdbc:mysql://127.0.0.1:3306/xxl-job?Unicode=true&characterEncoding=UTF-8
+spring.datasource.url=jdbc:mysql://127.0.0.1:3306/xxl_job?Unicode=true&characterEncoding=UTF-8
 spring.datasource.username=root
 spring.datasource.password=root_pwd
 spring.datasource.driver-class-name=com.mysql.jdbc.Driver