Remove remaining items from Django 2.2

.github/workflows/test.yml

@@ -33,9 +33,6 @@ jobs:
           # Exclude Django 4.0 for Python 3.7
           - python-version: '3.7'
             django-version: '4.0'
-          # Exclude Django 2.2 for Python 3.10
-          - python-version: '3.10'
-            django-version: '2.2'
 
     steps:
     - uses: actions/checkout@v2

docs/9_development.rst

@@ -41,6 +41,6 @@ Tox runs the same test set that is run by GitHub Actions, and your code should b
 
 If you wish to limit the testing to specific environment(s), you can parametrize the tox run::
 
-    $ tox -e py39-django22
+    $ tox -e py39-django32
 
 After you have pushed your changes, open a pull request on GitHub for getting your code upstreamed.