[issue45125] Improve tests and docs of how `pickle` works with `SharedMemory` obejcts

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset fc3511f18e92ea345092aa59a4225218bd19e153 by Miss Islington (bot) in branch '3.10':
bpo-45125: Improves pickling docs and tests for `shared_memory` (GH-28294)
https://github.com/python/cpython/commit/fc3511f18e92ea345092aa59a4225218bd19e153


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<https://bugs.python.org/issue45125>
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