docs: use absolute URL for openclaw video to fix GitHub rendering

Author: deeplook

docs/EXAMPLES.md

@@ -292,7 +292,7 @@ dirplot git . --animate --last 30d --output history.mp4
 ```
 
 <figure>
-  <video src="openclaw-871e8882..8445c9a5.mp4" autoplay loop muted playsinline width="100%"></video>
+  <video src="https://github.com/deeplook/dirplot/raw/main/docs/openclaw-871e8882..8445c9a5.mp4" autoplay loop muted playsinline width="100%"></video>
   <figcaption><code>dirplot git github://openclaw/openclaw --range 871e8882..8445c9a5 --animate --log --size 1920x1080 -o openclaw-871e8882..8445c9a5.mp4</code></figcaption>
 </figure>