Take a broken docs link like: https://docs.djangoproject.com/en/4.2/ref/databasess/ (two "s" chars at the end instead of one).

The 404 page could at least show the docs search bar to make it easy to search for the relevant page.

For bonus points, it could even show search results for the keywords in the URL ("databasess") or show close matches from existing URL's (using e.g. difflib.get_close_matches).