[docs] [issue31937] Add the term "dunder" to the glossary

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

I think it shouldn't be added as a separate entry, but just mentioned in [1] and [2], and added to the index.

[1] https://docs.python.org/3/glossary.html#term-special-method
[2] https://docs.python.org/3/reference/datamodel.html#specialnames

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keywords: +easy
nosy: +serhiy.storchaka
stage:  -> needs patch
type:  -> enhancement
versions: +Python 2.7, Python 3.6, Python 3.7

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