Adding a sub_section slot to overlay

[jonrohan]

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• [ ] Added/updated tests
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• [ ] Added/updated previews (Lookbook)
• [ ] Tested in Chrome
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[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 78591b195212c822a54bf5c1b08ebb290035bbd1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/view-components	Minor

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