Is there a command line reference guide for Big-IQ?

Yes, well, we get into that interesting discussion that BIG-IQ is really just a TMOS module. None of the tmsh commands in the guide you reference are BIG-IQ specific. To that end, I'd hope you'd find what you are looking for in the overall tmsh guide here: https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/bigip-tmsh-11-5-1.html.

The Operations Guide may also be useful: https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/f5-tmos-operations-guide-1-0.html.