Remove --example-workers 0 due to mypy bug

[adamtheturtle]

This removes --example-workers 0 from the pre-commit config due to a mypy race condition bug.

See python/mypy#18283

---

Note

Adjusts pre-commit configuration to avoid a mypy race condition.

• Updates .pre-commit-config.yaml to remove --example-workers 0 from doccmd invocations across *-docs hooks (e.g., shellcheck-docs, mypy-docs, pyright-docs, vulture-docs, pylint-docs, interrogate-docs, ty-docs, pyrefly-docs)
• Adds an explanatory comment referencing race in record_missing_stub_packages (No such file or directory: '.mypy_cache/missing_stubs') python/mypy#18283

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