gh-125188: Improve explanation of errors argument in urllib.parse

[CaQtiml]

I agree with the issue creator that it is better to clarify what errors is, so I point parse_qs, parse_qsl and unquote to quote, which already describes this parameter. I also add a reference to the codecs page for both encoding and errors.

• Issue: docs: improve explanation of the errors argument of urllib.parse functions #125188

[read-the-docs-community]

Documentation build overview

📚 cpython-previews | 🛠️ Build #34971449 | 📁 Comparing d01defb against main (ea0ee92)

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± library/urllib.parse.html