docs: add pytest 9.0+ native TOML configuration format

Update pyproject.toml examples to show the new `[tool.pytest]` native
TOML format introduced in pytest 9.0, while keeping `[tool.pytest.ini_options]`
for pytest 7.x/8.x compatibility.
Reference:
https://docs.pytest.org/en/stable/changelog.html#pytest-9-0-0-2025-11-05

Author: amureki

docs/index.rst

@@ -33,6 +33,18 @@ Example using pytest.ini or tox.ini
 Example using pyproject.toml
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
+For pytest 9.0 and later, use the native TOML format:
+
+.. code-block:: toml
+
+   # -- Example FILE: pyproject.toml
+   [tool.pytest]
+   DJANGO_SETTINGS_MODULE = "test.settings"
+   # -- recommended but optional:
+   python_files = ["test_*.py", "*_test.py", "testing/python/*.py"]
+
+For pytest 7.x and 8.x, use the INI-compatible format:
+
 .. code-block:: toml
 
    # -- Example FILE: pyproject.toml