add various module docstrings

docs/nix/render_options/__init__.py

@@ -1,3 +1,5 @@
+"""Module for rendering NixOS options documentation from JSON format."""
+
 # Options are available in the following format:
 # https://github.com/nixos/nixpkgs/blob/master/nixos/lib/make-options-doc/default.nix
 #

lib/test/container-test-driver/test_driver/__init__.py

@@ -1,3 +1,5 @@
+"""Test driver for container-based NixOS testing."""
+
 import argparse
 import ctypes
 import os