Update repos.md

repos.md

@@ -24,8 +24,8 @@ Then change key **baseurl**.
 
 I was overwhelmed by the amount of repo files. Message "Repository ** is listed more than once in the configuration" is keep poping out. So I decided to roll the repos all the way back to their original state. 
 
-  cd /etc/yum.repos.d
-  rm -f *
+    cd /etc/yum.repos.d
+    rm -f *
 
 Get CentOS-8.repo from http://mirrors.aliyun.com/repo/. 
 Create kubernetes.repo. Then write following code in it.