Add paragraph about __new__ (#358)

* Add paragraph about __new__
* [pre-commit.ci] auto fixes from pre-commit.com hooks
* Small changes to text

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Edoardo Baldi <edoardob90@gmail.com>

Author: 3 people