[skip ci] Add comments for ci cron logging (#8877)

Signed-off-by: Edward Zeng <jie.zeng@zilliz.com>

build/config/logging/cron-logging.yaml

@@ -1,10 +1,11 @@
+---
 apiVersion: v1
 kind: Namespace
 metadata:
   name: logging
 
+# create dameonset to rsync pod logs
 ---
-
 apiVersion: apps/v1
 kind: DaemonSet
 metadata:
@@ -42,4 +43,4 @@ spec:
       volumes:
         - hostPath:
             path: /var/log
-          name: varlog
+          name: varlog