[docs] Suggested improvement for glossary: define "tuple"

[Eliot, Christopher]

Greetings:

I've  been using this glossary<https://docs.python.org/3/glossary.html#glossary>, and wished it defined the word "tuple".

Thank you for all that you do,

Topher Eliot
christopher.eliot at nagrastar.com<mailto:christopher.eliot at nagrastar.com>
+01 303 706-5766

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