correct doc stricg for test_os_chdir

tests.py

@@ -12,7 +12,8 @@ mod = importlib.import_module("mpsd-software-environment")
 
 
 def test_os_chdir(tmp_path):
-    """Create a temporary directory for testing."""
+    """Test the os_chdir context manager."""
+    # create a temporary directory for testing
     temp_dir = tmp_path / "test_os_chdir"
     temp_dir.mkdir()