`Py_SETREF` and `Py_NewRef` is not explained in extending new types using a C extension

Documentation

The documentation for extending new types using a C extension just uses Py_SETREF and Py_NewRef with no extra clarification as to what those functions do. It'd be nicer and more convenient if they were explained on-the-spot instead of having to search for it in the docs. They are also not explained in the previous topic (that explains Py_INCREF and Py_DECREF) and the other topics thereafter.

Linked PRs

• gh-101234

從連結的新型別教學中的「提供對資料屬性更細緻的控制」一節開始。解釋 Py_SETREF 和 Py_NewRef 的使用位置，並檢查周圍的參照計數主題是否涵蓋一致；當讀者無需查閱其他地方就能理解這兩個函式時，文件就完成了。