Docs feedback: Create new merge request thread (discussions api) is missing important information for position[line_range]

https://docs.gitlab.com/13.2/ee/api/discussions.html#create-new-merge-request-thread

position[line_range] is required for creating certain discussions, but no documentation exists explaining what to provide for the parameters of position[line_range][start/end][line_code/type], nor how to figure out what those values should be in the first place.

No example is provided for the position[line_range] parameter either.