Fix: Remove --example-workers 0 only from mypy-docs

[adamtheturtle]

The previous PR incorrectly removed --example-workers 0 from all hooks.

This PR reverts that and correctly removes it only from the mypy-docs hook, which is the one affected by the mypy bug.

See python/mypy#18283

---

Note

Aligns pre-commit docs hooks with intended parallelism settings while exempting mypy.

• Re-adds --example-workers 0 to shellcheck-docs, pyright-docs, vulture-docs, pylint-docs, interrogate-docs, ty-docs, and pyrefly-docs
• Keeps mypy-docs without --example-workers 0; adds clarifying comment referencing mypy issue
• Configuration-only change in .pre-commit-config.yaml

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