docs(examples): add module docstring to video.py example

examples/picture.py

@@ -1,4 +1,10 @@
 #!/usr/bin/env python
+"""
+Example script demonstrating image generation using DALL-E 3.
+
+This script generates an image from a text prompt using OpenAI's DALL-E 3 model
+and prints the response containing a URL to the generated image.
+"""
 
 from openai import OpenAI
 

examples/video.py

@@ -1,4 +1,10 @@
 #!/usr/bin/env -S poetry run python
+"""
+Example script demonstrating video generation using Sora.
+
+This async script generates a video from a text prompt using OpenAI's Sora model
+and polls until the video generation is complete.
+"""
 
 import asyncio