docs: Improves `IntoPyObject` documentation in the guides#5835

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Cheukting wants to merge 12 commits intoPyO3:mainfrom

Cheukting:doc-5709

Commits on Feb 21, 2026

Document advanced `IntoPyObject` field customization with examples.
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Commits on Feb 22, 2026

Clarify `get_item` usage and update examples for field conversion customization.
Cheukting
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Add doc tests
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Simplify and clarify field conversion trait documentation.
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Add doc test for `#[pyo3(transparent)]` usage in `IntoPyObject` for structs and tuples.
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Document container and field attributes for `#[derive(IntoPyObject)]` and `#[derive(IntoPyObjectRef)]`.
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Clarify and format documentation for `#[pyo3]` attributes, improving readability and consistency.
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Fix formatting for `pyo3(default)` in field conversion trait documentation.
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