`_CallableGenericAlias` class and `typing.Callable` docstring should be corrected

Documentation

*Notes:

• Python 3.14.3
• Related: #145577

_CallableGenericAlias class should be corrected for example:

Represent `Callable[argtypes, resulttype]`. -> Represent `Callable[paramtypes, returntype]`.

t_args, t_result = args -> t_params, t_return = args

typing.Callable docstring should be corrected for example:

a function that takes a single parameter -> a function that has a single parameter

... to indicate optional or keyword arguments; -> ... to indicate optional or keyword parameters;

Linked PRs

• gh-145598

先在 CPython 的 typing 實作中搜尋 _CallableGenericAlias 和 typing.Callable 的 docstring。根據 issue 中的範例檢查措辭，然後確認兩處描述都使用了所要求的參數和回傳值術語；注意，該 issue 引用了相關聯的 PR gh-145598。