Fix: Use parent of fix commit (78178d1~1) for vulnerable Encoder checkout

documentation/modules/exploit/linux/http/avideo_encoder_getimage_cmd_injection.md

@@ -121,7 +121,7 @@ by the container entrypoint. The security fix in commit `78178d1` patched multip
 ```bash
 docker exec avideo-avideo-1 bash -c "
   git config --global --add safe.directory /var/www/html/AVideo/Encoder
-  cd /var/www/html/AVideo/Encoder && git checkout c9861e9c -- .
+  cd /var/www/html/AVideo/Encoder && git checkout 78178d1~1 -- .
 "
 docker compose restart avideo
 ```