[issue19697] Document the possible values for __main__.__spec__

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0427c2ff653d by Nick Coghlan in branch '3.4':
Issue #19697: document more __main__.__spec__ quirks
http://hg.python.org/cpython/rev/0427c2ff653d

New changeset a90254be2da2 by Nick Coghlan in branch 'default':
Issue #19697: merge docs from 3.4
http://hg.python.org/cpython/rev/a90254be2da2

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