[docs] [issue20477] Add examples of using the new contentmanager api to the email docs

R. David Murray added the comment: There being no objections, I have committed these. Now we'll see if Antoine or someone corrects my google-translated French in post review... ---------- resolution: -> fixed stage: commit review -> committed/rejected status: open -> closed _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue20477> _______________________________________