Exclude db/types.py from sphinx-apidoc target
SQLAlchemy 1.4.27 released on Nov 11, and tox-docs job error become
to occur since then.
`:ref:` attribute introduced from 1.4.27 in docstring of the parent
class of our TypeDecorator cannot be referred.
This patch fixes the error by excluding db/types.py from target of
sphinx-apidoc.
@@ -49,6 +49,9 @@ apidoc_excluded_paths = [
'vnfm/workflows',
'db/migration/alembic_migrations/*',
'db/migration/alembic_migrations',
+ # TODO(ueha): Excluding 'db/types.py' will be removed after the issue of
+ # TypeDecorator is fixed.
+ 'db/types.py',
'hacking']
apidoc_separate_modules = True
