Example:
https://docs.python.org/3.11/whatsnew/3.11.html

In HTML source, you'll find:

<link rel="canonical" href="https://docs.python.org/3/whatsnew/3.11.html" />

This is a bad canonical link (404) since /3/ at the moment points at 3.9 (and very soon will point at 3.10) where there is no "What's New in Python 3.11" page. This is a problem because search engines and social networking link scrapers redirect to canonical links by default.

We should be smarter about this so that newer documentation editions than the default /3/ should simply skip the canonical link altogether. This is the simplest thing we can do that will ensure that:

• there is no 404 redirect
• nothing breaks when that version becomes the default and we start redirecting it to /3/