docs: use from_native / to_native in series.py

[MarcoGorelli]

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• 💾 Refactor
• ✨ Feature
• 🐛 Bug Fix
• 🔧 Optimization
• 📝 Documentation
• ✅ Test
• 🐳 Other

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Checklist

• Code follows style guide (ruff)
• Tests added
• Documented the changes

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[FBruzzesi]

Commenting just for visibility and sharing my opinion. I have some mixed feelings about my_library_agnostic_function naming 😇 Maybe it could be a good community topic for Friday call?

[MarcoGorelli]

😄 yup, definitely!

i think it's still clearer than func though - ok to merge as-is before merge conflicts come in, and then we do a find-and-replace when we decide on a better name?