urllib.parse - quote/unquote documentation issues

https://docs.python.org/3/library/urllib.parse.html

1. It's my understanding that the arguement in the displayed usage shows the default. So:
   urllib.parse.quote(string, safe='/', encoding=None, errors=None)
   means that errors defaults to NoneType, however, the documentation just below that says:

"errors defaults to 'strict'

2. quote: There isn't a list of possible values for the "errors" argument

3. unquote - There isn't a list of possible values for the "errors" argument

4. unquote -

errors defaults to 'replace', meaning invalid sequences are replaced by a placeholder character.

What "placeholder character" is it that's used?

5. unquote

encoding defaults to 'utf-8'. errors defaults to 'replace', meaning invalid sequences are replaced by a placeholder character.

Is a single line. errors should be on a new line (all arguements for all functions really should always be on a new line unless there's a compelling reason not to. To do otherwise significantly impedes readability, while increasing the chances of misunderstanding).

Start with the linked urllib.parse documentation page and review the quote and unquote signatures and surrounding parameter descriptions. Resolve the reported defaults, errors value lists, placeholder-character explanation, and formatting concerns, with the page clearly documenting each function's arguments and behavior.