[8.16] [Docs] Update Dashboard docs for chart switch redesign in 8.16.0 (#197543) (#197737)

# Backport

This will backport the following commits from `main` to `8.16`:
- [[Docs] Update Dashboard docs for chart switch redesign in 8.16.0
(#197543)](#197543)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT
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Update Dashboard docs for chart switch redesign in 8.16.0
(#197543)\n\n## Summary\r\n\r\nUpdated visuals in Dashboard docs for
chart switch redesign and related\r\nchanges.\r\n\r\nCloses:
[#538](https://github.com/elastic/platform-docs-team/issues/538)\r\nRel:
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Update Dashboard docs for chart switch redesign in
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Update Dashboard docs for chart switch redesign in 8.16.0
(#197543)\n\n## Summary\r\n\r\nUpdated visuals in Dashboard docs for
chart switch redesign and related\r\nchanges.\r\n\r\nCloses:
[#538](https://github.com/elastic/platform-docs-team/issues/538)\r\nRel:
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Update Dashboard docs for chart switch redesign in 8.16.0
(#197543)\n\n## Summary\r\n\r\nUpdated visuals in Dashboard docs for
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[#538](https://github.com/elastic/platform-docs-team/issues/538)\r\nRel:
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BACKPORT-->

Co-authored-by: wajihaparvez <[email protected]>

Author: kibanamachine