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

[Serhiy Storchaka]

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

The term "dunder" is used in PEPs: PEP 8, PEP 408, PEP 435, PEP 505, PEP 520, PEP 526, and in the enum module documentation.

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