Fix: Custom block editor link

[jorgefilipecosta]

The old link docs/how-to-guides/platform/custom-block-editor/README.md does not exist. The correct link to use is /docs/how-to-guides/platform/custom-block-editor.md.

Testing

I opened https://github.com/WordPress/gutenberg/blob/4026413d9d7d435d55b5432a324d42eb0e5fb301/packages/block-editor/README.md and "creating an editor".

[github-actions]

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[github-actions]

Flaky tests detected in 583958e.
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/9227408613
📝 Reported issues:

• [Flaky Test] submenu click on the arrow interactions #61884 in /test/e2e/specs/editor/blocks/navigation-frontend-interactivity.spec.js