Fix Docker image name in README.md

Author: aobolensk

docker/README.md

@@ -9,5 +9,5 @@
 Build multi-architecture Ubuntu 24.04 development image:
 
 ```bash
-docker buildx build --platform linux/amd64,linux/arm64 -t ghcr.io/aobolensk/openvino_devutils/ubuntu:latest -f ./ubuntu.Dockerfile .
+docker buildx build --platform linux/amd64,linux/arm64 -t ghcr.io/learning-process/ppc-ubuntu:latest -f ./ubuntu.Dockerfile .
 ```