Fix: Improve HTML semantics for table used in site-health debug tab

[hbhalodia]

Trac ticket: https://core.trac.wordpress.org/ticket/62880

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Props hbhalodia, sabernhardt, mukesh27.

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[sabernhardt]

Thanks for the PR!

The th header cells still need the mobile adjustments:

	.health-check-table th,
	.health-check-table td {
		box-sizing: border-box;
		display: block;
		width: 100%;
		word-wrap: break-word;
	}

	.health-check-table th,
	.health-check-table td:first-child {
		width: 100%;
		padding-bottom: 0;
		font-weight: 600;
	}

[sabernhardt]

We could also consider inherit in case the admin font size increases, but the td cells for these tables are 13px anyway.

[hbhalodia]

Hi @sabernhardt, For now I have not changed it to inherit as per the comment, let me know if we need to do that as well, I would update the PR.

[mukeshpanchal27]

The changes looks good to me.