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

Roundup Robot added the comment: New changeset a9d7d53d5fbd by R David Murray in branch 'default': #20477: add examples of using the new contentmanager API. http://hg.python.org/cpython/rev/a9d7d53d5fbd ---------- nosy: +python-dev _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue20477> _______________________________________