docs: Fix git-format-staged in precommit documentation

[Pietrucci-Blacher]

Hello, here is a little proposal to clean some deprecated stuff in the git-format-staged section on the pre-commit page.

Description

I deleted / replaced old commands that have been deprecated or removed in Husky.

Checklist

• [ ] I’ve added tests to confirm my change works.
• [ ] (If changing the API or CLI) I’ve documented the changes I’ve made (in the docs/ directory).
• [ ] (If the change is user-facing) I’ve added my changes to changelog_unreleased/*/XXXX.md file following changelog_unreleased/TEMPLATE.md.
• [x] I’ve read the contributing guidelines.

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