Added definition for Mktg efficiency ration on Rev mktg page
Marketing Efficiency Ratio
Marketing efficiency for a given month is calculated as the ratio of IACV from closed won opportunities for the current month and the 2 preceding months vs the Marketing Operating Expenses (IACV / Marketing Operating Expenses) for the same time period. GitLab's target is greater than 2.
I believe this is the last of the KPI's on the index that was not linked to a definition. Next step would be getting this into Periscope.
@darawarde @twbarr please review and merge if this makes sense.