Sub-parent Issue: Update INTERNAL Benefits documentation for Enghouse pathways

[o-ram]

The parent issue for a series of sub-issues that will need to happen in order to update our internal team Benefits onboarding documentation to cover the different steps involved when an agency has selected Enghouse

Related to #715

[o-ram]

@laneymangan I turned this into a parent issue and assigned you to the sub-issue, which is just for adding your notes into the draft SOP document. I think that better reflects where we are at but let me know if you have any issues with that