[issue19697] Document the possible values for __main__.__spec__

[Eric Snow]

Eric Snow added the comment:

That did the trick, Nick.  I swear there's always something I forget about ReST. :)

Otherwise do you have any objections to the patch?  I imagine there's more we could put in the section (for language spec purposes), but I figure what I have there is good enough for the moment.

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