Update MD024 Markdownlint rule to latest definition

What does this MR do?

Update Markdownlint rule MD024 to the latest definition.

• Older definition: https://github.com/DavidAnson/markdownlint/blob/v0.31.1/doc/Rules.md#md024---multiple-headings-with-the-same-content
• Newest definition: https://github.com/DavidAnson/markdownlint/blob/v0.33.0/doc/Rules.md#md024---multiple-headings-with-the-same-content

Related to gitlab-docs#1761 (closed)

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changed milestone to %16.9

added Technical Writing docs-linting docsimprovement documentation maintenancerefactor typemaintenance labels

assigned to @eread

@kpaizee Could you review? We've been using a now-removed configuration style for one of our rules, so this moves us to the new way of specifying the same test.

The links to a version of the rules that supported both styles and to the current rule style is in the MR description.

Thanks!

requested review from @kpaizee

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Category	Reviewer	Maintainer
.markdownlint.yml	Reviewer review is optional for .markdownlint.yml	@susantacker (UTC-5, 16 hours behind author)

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requested review from @dianalogan

approved this merge request

@dianalogan, thanks for approving this merge request.

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mentioned in merge request gitlab-runner!4610 (merged)

approved this merge request

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approved this merge request

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enabled an automatic merge when all merge checks for 73221167 pass

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mentioned in commit 33985c7d

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