3.13 Better Document `__replace__` on Dataclasses and Named Tuples

Documentation

With named tuples and dataclasses now implementing __replace__, it would be good to have some clearer documentation on this somewhere. Type-checkers will likely have to implement support as a specific implementation detail, which MyPy is already starting to do (see here, for example), so having more formal documentation of this fact would helpful.

首先檢視 CPython PR 108752，以及現有的 dataclasses 和 named tuples 文件。找出文件中的適當位置，然後記錄它們對 replace 的支援，以及 issue 中描述的型別檢查器實作細節。在不依賴連結的實作變更的情況下，清楚涵蓋該行為及其影響，即表示完成。