docs: improve explanation of the `errors` argument of `urllib.parse` functions

Documentation

The URL quoting/unquoting functions in urllib.parse all have an errors argument, which is passed on to internal encode and decode functions.

The full explanation of what errors means is only explained in urllib.parse.quote.
The documentation for the other functions explains the the default behavior, but not any alternatives.

Each other function's documentation should should point to urllib.parse.quote for an explanation of errors.

阅读 urllib.parse 文档中关于 quote 以及其他 URL 引用和取消引用函数的内容。以 quote 对 errors 参数的现有说明为参考，然后确保每个其他函数都指向该说明，并运行相关的文档构建来检查链接和措辞。