Fix typo in 'Download Capacity CSV report' feature implementation.
Add test for CapacityLogCsvHandler.
Minor changer on capacity description on the Support page

Change-Id: Ifa34e74ba0e21c10a36e99519e033d9dc9d4bc7b
Merge "Fix typo in 'Download Capacity CSV report' feature implementation. Add test for CapacityLogCsvHandler. Minor changer on capacity description on the Support page"