Changed `query` to be default on search-events. Changed `report_uuidz` to be default on get-assets and get-history. Changed `risk` and `confidence` to enum on get-reports. Added examples to RFC3339 format.
Changed `query` to be default on search-events.
Changed `report_uuidz` to be default on get-assets and get-history.
Changed `risk` and `confidence` to enum on get-reports.
Added examples to RFC3339 format.

demisto/content,VirusTotal/content,VirusTotal/content,VirusTotal/content,demisto/content,demisto/content,VirusTotal/content,demisto/content