Document reporting usage calculation

[S-Haime]

Describe the area of the documentation you would like updated/added.
We should document how we calculate usage, e.g. define a view / download / usage. etc.

[StephDriver]

BRF. add definitions of what is being displayed to the exisiting reports. e.g. if report is articles 31 July -9 Sept, does that include the end dates? Published, submitted? etc.

[S-Haime]

Your current work may address this