Documentation Standard

I recently came about an interesting book, "Documenting Software Architecture". It tells you how you can standardize documentation. I m curious, how ppl/orgs maintain their internal documentation for DBAs? There are all sorts of views on this, though...

1. Documentation platform like, confluence.
2. Word Docs
3. PyDoc type documentation
4. Documentation along with code, in markdown files etc.

What do you use, in your org, and if you can possibly explain, why please?

Thanks,
Yogi
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