Fix Broken Links in Package file

[shail-mehta]

What?

Fixes 3 broken (404) links found on the Block Editor Handbook — Packages reference page

• packages README
• @wordpress/build README
• package guidelines

Why?

While browsing the Packages reference documentation, I found that the above 3 links returned a 404 error.

How?

This PR corrects all 3 links so they point to valid, existing pages.

Testing Instructions

• Open docs/reference-guides/packages.md file
• See all 3 Links

Use of AI Tools

None

[github-actions]

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Co-authored-by: shail-mehta <shailu25@git.wordpress.org>

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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Updates the packages reference guide to point readers to newer documentation locations instead of repository README files.

Changes:

• Replaces the Gutenberg packages README link with the contributor guide on managing packages.
• Replaces the @wordpress/build README link with the WordPress Developer Resources page.
• Adjusts the “package guidelines” link target within the document.

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[github-actions]

Flaky tests detected in 41702c6.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/31927565140
📝 Reported tests:

adds and activates a new tab when pressing Enter at the end of a tab label in /test/e2e/specs/editor/blocks/tabs.spec.js, passed after 2 failed attempts.

Error: expect(locator).toHaveCount(expected) failed

Locator:  locator('[name="editor-canvas"]').contentFrame().getByRole('tab')
Expected: 3
Received: 2
Timeout:  5000ms

Call log:
  - Expect "toHaveCount" with timeout 5000ms
  - waiting for locator('[name="editor-canvas"]').contentFrame().getByRole('tab')
    14 × locator resolved to 2 elements
       - unexpected value "2"

    at /home/runner/work/gutenberg/gutenberg/test/e2e/specs/editor/blocks/tabs.spec.js:146:25
Error: expect(locator).toHaveCount(expected) failed

Locator:  locator('[name="editor-canvas"]').contentFrame().getByRole('tab')
Expected: 3
Received: 2
Timeout:  5000ms

Call log:
  - Expect "toHaveCount" with timeout 5000ms
  - waiting for locator('[name="editor-canvas"]').contentFrame().getByRole('tab')
    14 × locator resolved to 2 elements
       - unexpected value "2"

    at /home/runner/work/gutenberg/gutenberg/test/e2e/specs/editor/blocks/tabs.spec.js:146:25