Inception on https://docs.typo3.org/m/typo3/docs-how-to-document/main/en-us//Howto/WritingDocForExtension/Index.html

[mabolek]

The first paragraph links to https://github.com/TYPO3-Documentation/TYPO3CMS-Example-ExtensionManual, which is archived and links back to https://docs.typo3.org/m/typo3/docs-how-to-document/main/en-us//Howto/WritingDocForExtension/Index.html in the Readme