Docs on JULIA_NUM_THREADS env var should mention threadpools #48960
Description
i was looking for docs on what JULIA_NUM_THREADS=8,1 means, and navigated to https://docs.julialang.org/en/v1.9.0-rc1/manual/environment-variables/#JULIA_NUM_THREADS where i expected this is be explained
It is explained over in the multi-threading part of the manual at https://docs.julialang.org/en/v1.9.0-rc1/manual/multi-threading/#man-threadpools (and i also found #42302 (comment)), but it'd be good to mention on the env vars page too i think