Docs: How-to Guides > Meta Boxes - Update metabox.md

[juanmaguitar]

What?

Small fix and link correction for https://developer.wordpress.org/block-editor/how-to-guides/metabox

Why?

To improve readability and learning journey

[github-actions]

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Co-authored-by: juanmaguitar <juanmaguitar@git.wordpress.org>
Co-authored-by: fabiankaegy <fabiankaegy@git.wordpress.org>
Co-authored-by: bph <bph@git.wordpress.org>

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[bph]

The developer blog post: Creating a custom block that stores post meta might also be interesting for the reader of the page. Not quite sure where it fits in though, more at the beginning or at the end... 🤔

[github-actions]

Flaky tests detected in 9a56781.
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/8926170134
📝 Reported issues:

• [Flaky Test] name is correctly hydrated for different values #57881 in /test/e2e/specs/interactivity/directive-bind.spec.ts