Section F.1 identifies two supporting documents that are included in the design. The second one, the "XSEDE Identity Management Client Application Setup" document, should not be a Google Doc. It needs to be delivered as a Web page somewhere in the XSEDE web space, preferably in the existing places that science gateways, service providers, and campus IT admins go for information about XSEDE.
So I agree that this doc is necessary and important, but I think the design doc should say something along the lines above about how the document is delivered and available to people who need it. It should also be clear that the target audience includes: gateway providers, service providers, and campus IT admins. (I'm not sure... Are there any other important users of XSEDE Web SSO?)