Improve documentation of optional flex-model and flex-context #142
Description
I believe the function now should be more helpful in its docstring
- there is no fetching if there is no explicit flex model, but that only applies to the asset case of working.
- flex context and flex model being optional is not mentioned (for model starting 0.29 - we could mention that now already)
- how should the flex context and model even look like? Can we link to our docs?
Originally posted by @nhoening in #141 (review)