[3.2.x] Fixed typo in docs/topics/testing/advanced.txt.
[3.2.x] Fixed typo in docs/topics/testing/advanced.txt.

Backport of 6993e1bf6dff04b6e3ab284b154397b341463b50 from main

koordinates/django,wkschwartz/django,wkschwartz/django,koordinates/django,koordinates/django,wkschwartz/django,wkschwartz/django,koordinates/django