[doc] Fix broken link in the installation for CPU

[yankay]

Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.

Purpose

Fix #19974

Test Plan

Build the documentation and view it.

mkdocs build

Test Result

The page is working correctly.

(Optional) Documentation Update

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[gemini-code-assist]

Summary of Changes

Hello @yankay, 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 addresses a broken link in the documentation related to CPU installation by fixing an incorrect file path. The change ensures that the build.inc.md content is correctly included in the ARM and x86 CPU installation instructions, improving the accuracy and usability of the documentation.

Highlights

• Documentation Fix: Corrected an incorrect relative path for an included documentation snippet (build.inc.md) within the CPU installation guides for both ARM and x86 architectures.

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[gemini-code-assist]

Code Review

This pull request effectively addresses the reported issue by correcting broken links in the CPU installation documentation for both ARM and x86 architectures. The changes are precise and directly improve the maintainability and user experience of the documentation.

[houseroad]

Looks reasonable.