Add documentation describing parameters in conversion.py
Some function parameters (eg see https://lscsoft.docs.ligo.org/bilby/conversion.html#bilby.gw.conversion.generate_component_spins) dont have comments describing them. It would be helpful if they have some notes on what they are.
Table E1 would be a good starting point to write the definitions (https://dcc.ligo.org/DocDB/0168/P2000168/002/BilbyGWTC.pdf)