cbimport JSON/CSV -generate-key flag is in the optional section

Problem

-generate-key flag is a required flag when using list and line format. It is current under the Optional flag list in the docs

Expectation 

For the -generate-key flag to be in the required section and not in the Optional section in the docs

Notes

On first glance it appears to be optional, but actually required for list/lines format which is the main use case.