clarified docs for env-vars and config files #13050
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More links between sections are added.
It should bring all documentation together
in a more coherent manner.
The Environemnt variables section has been
cleaned.
Now there are not 3 random examples which
might have confused users to only suspect that those 3 examples where the only available ones.
Now this section clarifies how any CLI-option
is specified through an env var, and clarifies
that the shell example, is an example.