docs: use zero value for bools with no default values

[Codelax]

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Description

A lot of fields don't have a default value set, we could set a default function for the default value. Bool are false per default, this could improve documentation

How I imagine scw could expose this functionality

> scw instance server create -h
...
  [ipv6=false]                         Enable IPv6
  [stopped=false]                      Do not start server after its creation
...

References

#2813