[issue33832] doc Add "magic method" entry to Glossary

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Several hours ago, I read the unittest.mock doc, which uses 'magic methods' to explain MagicMock.  So I decided an entry really was needed.  Andrés, thanks for sticking with this,

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versions:  -Python 3.6

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