docs(sbb-accordion): fix documentation

[mcilurzo]

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• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

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Changes

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Browsers

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• Firefox Desktop
• Chrome Desktop
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• Safari Mobile

Screen readers

I tested the build on the following browsers:

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• JAWS Chrome Desktop
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• NVDA Chrome Desktop
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Does this introduce a breaking change?

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Other information

[jeripeierSBB]

LGTM, thanks :)