atexit module (code, tests and docs)

[smontanaro]

BPO	400620
Nosy	@gvanrossum, @freddrake, @smontanaro
Files	None: None

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields: ```python assignee = 'https://github.com/freddrake' closed_at = created_at = labels = [] title = 'atexit module (code, tests and docs)' updated_at = user = 'https://github.com/smontanaro' ``` bugs.python.org fields: ```python activity = actor = 'fdrake' assignee = 'fdrake' closed = True closed_date = None closer = None components = ['None'] creation = creator = 'skip.montanaro' dependencies = [] files = ['2462'] hgrepos = [] issue_num = 400620 keywords = ['patch'] message_count = 3.0 messages = ['32819', '32820', '32821'] nosy_count = 3.0 nosy_names = ['gvanrossum', 'fdrake', 'skip.montanaro'] pr_nums = [] priority = 'normal' resolution = None stage = None status = 'closed' superseder = None type = None url = 'https://bugs.python.org/issue400620' versions = [] ```

[smontanaro]

[freddrake]

Checkin includes markup revisions in the documentation section and additional reference to the atexit module from sys.exitfunc documentation.

[gvanrossum]

Seems fine to me.