Contributing tutorial has outdated version 2.2

[Mike Edmunds]

The Writing your first contribution for Django tutorial refers to version 2.2 a couple of times in the Writing documentation section. Although it does say "at the time of this writing," that's still 7+ years out of date (at the time of this writing).

​https://docs.djangoproject.com/en/6.1/intro/contributing/#writing-documentation

Would we want to add this to the list of places the version number should be bumped at the start of each release cycle?

Or if we're comfortable leaving the outdated version in the tutorial, closing this ticket "wontfix" will at least record that decision (where it can hopefully be found by the next person who notices the old version number).

[There are also some problems with the Sphinx content in that section, for which I'll open a typo PR.]