[docs] The collapsible table example reports wrong number of rows to the screen reader

[silviuaavram]

Steps to reproduce

Steps:

1. Open this link to live example: https://mui.com/material-ui/react-table/#collapsible-table
2. Open VoiceOver and navigate to the table element with the screen reader focus.
3. While collapsed, table reports 11 rows, whereas there are only 5 rows and one header.

Current behavior

Wrong number of rows narrated (11)

Expected behavior

Should be 6.

Context

#47653 (comment)

Your environment

No response

Search keywords: accessibility, collapsible table, docs

[github-actions]

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