Fix the docker image path

[mhelf-intel]

Fixed the docker image path and replaced the actual Gaudi version in the FAQ document with a variable to avoid manual editing with each release.

[Copilot]

Pull request overview

This PR corrects the Docker image path in the quickstart documentation by updating the image name from vllm-installer to vllm-plugin. This ensures users reference the correct Docker images when setting up vLLM on Gaudi hardware.

• Updated Docker image path references from vllm-installer-{{ PT_VERSION }} to vllm-plugin-{{ PT_VERSION }}
• Corrected documentation text describing the Docker image prefix requirement

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
docs/getting_started/quickstart/quickstart_configuration.md	Updated three DOCKER_IMAGE variable examples to use the correct vllm-plugin prefix instead of vllm-installer
docs/getting_started/quickstart/quickstart.md	Corrected the DOCKER_IMAGE description and example to reference vllm-plugin prefix instead of vllm-installer

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[github-actions]

🚧 CI Blocked

The main CI workflow was not started for the following reason:

Your branch is behind the base branch. Please merge or rebase to get the latest changes.