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.

閱讀 urllib.parse 文件中關於 quote 及其他 URL quoting 和 unquoting 函式的內容。以 quote 現有對 errors 引數的說明作為參考，接著確保每個其他函式都指向該說明，並執行相關的文件建置，以檢查連結和措辭。