Used https in main-dashboard-button.md file

[shail-mehta]

Fixes: #68882

What?

Used https Instead of http in URL in below documentation file

• docs/reference-guides/slotfills/main-dashboard-button.md

Why?

http://wordpress.org is redirecting on https://wordpress.org

Testing Instructions

• Open docs/reference-guides/slotfills/main-dashboard-button.md file
• See There are several instances using http://wordpress.org it should be https://wordpress.org

[github-actions]

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Co-authored-by: shail-mehta <[email protected]>
Co-authored-by: t-hamano <[email protected]>
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[github-actions]

Flaky tests detected in 022ac90.
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/12965770595
📝 Reported issues:

• [Flaky Test] should show the original content after revert and page reload #68604 in /test/e2e/specs/site-editor/template-revert.spec.js

[t-hamano]

Good catch 👍