Misleading documentation regarding Preview Renderers

[JonEG]

Current behavior

The documentation states that the content elements text, textpic, textmedia and image have their own PreviewRenderer.

Expected behavior/output

Explain that they no longer exist, and what the best approach would be now.

Links

The last note, is the one that mentions this.
CustomBackendPreview link

TYPO3 versions

They were removed in version 13.3, still existed in 13.1

-https://github.com/TYPO3/typo3/tree/13.1/typo3/sysext/frontend/Classes/Preview
-https://github.com/TYPO3/typo3/tree/13.3/typo3/sysext/frontend/Classes/Preview

Possible Solution

Please explain whether the best approach for these is to either extend the StandardContentPreviewRenderer or implementing custom preview renderers.

Personal Request

I could not find any deprecation information about it online, please let me know if you find anything regarding these files deprecation.