docs: Fix broken PR guideline hyperlink

[pcw109550]

Description

Fix invalid hyperlink.

[coderabbitai]

Walkthrough

Walkthrough

The change involves an update to a hyperlink within a contributing guide document. The path to the pull request guidelines has been modified, indicating a restructuring of the documentation directory. This alteration will necessitate updates in any files or documentation that previously linked to the old path.

Changes

File Path	Change Summary
CONTRIBUTING.md	Updated hyperlink path from handbook/pr-guidelines.md to docs/handbook/pr-guidelines.md

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