modified comments

Author: Yoichi Kawasaki

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 ## 0.6.0 - 2018-05-13
 - Support Storage Size Scale Change
-- Restrict Alert Metric to Accept: only "cpu_percent" for vCore scale change, only "storage_percent"|"storage_used"|"storage_limit" for Storage size scale change
+- Restrict Alert Metrics to accept: only `cpu_percent` for vCore scale change, only `storage_percent`,`storage_used` or `storage_limit` for Storage size scale change
 - Change Webhook timeout to PT10M (10 minutes)
 
 ## 0.5.0 - 2018-04-29