Site Health: Fix incorrect persistent object cache documentation link anchor.

[NoumaanAhamed]

Description

This PR addresses Trac Ticket #65477 by fixing a broken anchor link in the Site Health tool.

The "Learn more about persistent object caching" link previously directed users to https://developer.wordpress.org/advanced-administration/performance/optimization/#persistent-object-cache. This anchor is incorrect and does not work.

This update changes the anchor to the correct one: #object-caching.

Testing Instructions

1. Navigate to Tools > Site Health in your WordPress admin dashboard.
2. If your local environment is not using a persistent object cache, you should see the recommended improvement: "You should use a persistent object cache".
3. Click the link "Learn more about persistent object caching."
4. Verify that the link correctly redirects to the specific #object-caching section on the Advanced Administration documentation page.

[github-actions]

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[github-actions]

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