[docs] [issue33032] Mention implicit cache in struct.Struct docs

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:


New changeset 3666b3c1f695a145adab1bf644c22e564e8eb0ee by Gregory P. Smith (Zackery Spytz) in branch 'master':
bpo-33032: Mention the implicit cache in struct.Struct() docs (GH-7700)
https://github.com/python/cpython/commit/3666b3c1f695a145adab1bf644c22e564e8eb0ee


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nosy: +gregory.p.smith

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