* Update to improve the private registry docs
* minor adjustments
I know it's totally OK to enumerate a list using the same number in markdown, but for the sake of people reading the raw docs, I'd still like them to be numbered.
Also removed a superfluous `version: 3` and made sure all other versions were set to `"3.4"`.
Co-authored-by: Simon Aronsson <simme@arcticbit.se>