julia

70146812 - Small doc clearifications on embedding and the GC, plus information on threading restrictions (#43966)

Small doc clearifications on embedding and the GC, plus information on threading restrictions (#43966) * Small clarifications on embedding and the GC, plus more information on restrictions when embedding in a multi-thread environment * Fix wide code blocks, add syntax highlight, small tweaks to text * Trim trailing whitespace Co-authored-by: Paul Melis <paul.melis@surfsara.nl>