docs: it should be xxl-job-admin/src/main/resources/application.properties

doc/XXL-JOB-English-Documentation.md

 #### Step 1:Configure Schedule Center
 Configure file’s path of schedule center is as follows:
 
-    /xxl-job/xxl-job-admin/src/main/resources/xxl-job-admin.properties
+    /xxl-job/xxl-job-admin/src/main/resources/application.properties
 
 
 The concrete contet describe as follows:

doc/XXL-JOB官方文档.md

 #### 步骤一：调度中心配置：
 调度中心配置文件地址：
 
-    /xxl-job/xxl-job-admin/src/main/resources/xxl-job-admin.properties
+    /xxl-job/xxl-job-admin/src/main/resources/application.properties
 
 
 调度中心配置内容说明：