[Doc] Fix link errors and add section anchors

[herizhen]

What this PR does / why we need it?

This PR fixes broken links in the documentation (such as the Docker installation guide link and the msmodelslim quantization method link) and adds explicit anchors ({: #5-online-service-deployment }) to the "5 Online Service Deployment" headers across various model tutorial files to ensure correct cross-referencing.

Does this PR introduce any user-facing change?

No, this is a documentation-only update.

How was this patch tested?

Verified that the links and anchors are correct.

• vLLM version: v0.26.0
• vLLM main: vllm-project/vllm@0351e9a

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on improving the documentation quality by fixing broken or outdated links and adding consistent anchors to deployment sections. These changes ensure that users can reliably access external resources and navigate the documentation more effectively.

Highlights

• Documentation Anchors: Added unique HTML anchors to 'Online Service Deployment' headers across multiple model tutorial files to improve navigation and cross-referencing.
• Link Correction: Updated the Docker installation guide link in 'quick_start.md' to point to the correct 'get-started' path.
• External Resource Update: Corrected the 'msmodelslim' documentation link in the 'DeepSeek-V3.1.md' tutorial to ensure accurate resource access.

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[gemini-code-assist]

Code Review

This pull request updates several documentation files to fix broken links (such as the Docker installation guide and the msmodelslim quantization method link) and adds explicit section anchors ({: #5-online-service-deployment }) to the "5 Online Service Deployment" headers across multiple model tutorial files. The reviewer pointed out that the PR title and description do not follow the repository's Pull Request Summary Style Guide and provided a compliant template to use.