[Forward port v3.1] Update documentation for node bootstrap #708
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We have [started the 3.1 documentation folder "for real"](https://github.com/digital-asset/docs.daml.com/pull/675). This pull requests makes changes to 2.9.0; please consider whether this should be forward-ported to 3.1 before merging it.
Originally posted by @garyverhaegen-da in #673 (comment)