ruff docstring formatting

tests/test_repository.py

@@ -1143,7 +1143,7 @@ class BuildRepoRootTests(TestCase):
         self.assertEqual(cs.get(("user",), "name"), b"Jelmer")
 
     def test_worktreeconfig_extension_case(self):
-        """Test that worktree code does not error for alternate case format"""
+        """Test that worktree code does not error for alternate case format."""
         r = self._repo
         c = r.get_config()
         c.set(("core",), "repositoryformatversion", "1")