This is the XML source for https://datatracker.ietf.org/doc/draft-ietf-rtgwg-backoff-algo/
Changes to the document can be proposed using the github GUI by clicking on the XML source and then clicking on the little pencil to fork and edit the document. Modify the document, click on "propose changes" and then click on "create pull request". This will then allow the editors of the document to easily incorporate proposed changes.
Alternatively, you can fork this repository (which creates your own copy on Github), make edits, and then create a pull request, to have those changes pulled from the forked repository to this repository.
You should be able generate the text version of the most recent XML commit using this URL. http://xml2rfc.tools.ietf.org/cgi-bin/xml2rfc.cgi?url=https://raw.githubusercontent.com/Bruno007/draft-ietf-rtgwg-backoff-algo/master/draft-ietf-rtgwg-backoff-algo.xml&modeAsFormat=txt/ascii&type=ascii
And this should produce a diff of the most recently published ietf draft, and the latest version in the repository. https://tools.ietf.org/rfcdiff?url1=draft-ietf-rtgwg-backoff-algo&url2=https://tinyurl.com/jkkq3ed