python/layout: Re-order modules section

docs/python/layout.rst

@@ -65,21 +65,8 @@ Packages
 
    We don't use the `src/ layout <https://blog.ionelmc.ro/2014/05/25/python-packaging/#the-structure>`__. Although a `single blog post <https://blog.ionelmc.ro/2015/02/24/the-problem-with-packaging-in-python/>`__ and a few passionate developers have popularized the idea, in practice, we rarely encounter the problems it solves, and our use of :ref:`check-manifest<python-package-release-process>` and `test_requirements.py <https://github.com/open-contracting/standard-maintenance-scripts/blob/main/tests/test_requirements.py>`__ guard against those problems.
 
-.. _layout-tests:
-
-Test files
-----------
-
--  Put `tests outside application code <https://docs.pytest.org/en/latest/explanation/goodpractices.html#choosing-a-test-layout-import-rules>`__. Do not add ``tests`` directories inside application code.
--  Prefix filenames with ``test_``. Do not suffix basenames with ``_test``.
-
-Static files
-------------
-
--  Don't mix static files with Python files in the same directory.
-
-Module files
-------------
+Modules
+-------
 
 -  Use a single module for all models.
 -  If a module defines names that are imported by only one other module, merge the modules unless:
@@ -94,6 +81,19 @@ Module files
    -  :ref:`fat-models`
    -  `FastAPI documentation <https://sqlmodel.tiangolo.com/tutorial/code-structure/#single-module-for-models>`__
 
+.. _layout-tests:
+
+Test files
+----------
+
+-  Put `tests outside application code <https://docs.pytest.org/en/latest/explanation/goodpractices.html#choosing-a-test-layout-import-rules>`__. Do not add ``tests`` directories inside application code.
+-  Prefix filenames with ``test_``. Do not suffix basenames with ``_test``.
+
+Static files
+------------
+
+-  Don't mix static files with Python files in the same directory.
+
 Filename conventions
 --------------------