bpo-36487: Make C-API docs clear about what the main interpreter is. (gh-15080)

(cherry picked from commit 854d0a4b98b13629252e21edaf2b785b429e5135) (gh-12666)

Co-authored-by: Joannah Nanjekye <33177550+nanjekyejoannah@users.noreply.github.com>
2 files changed