nix/tests: run test help.sh only if nix is built with documentation (backport #11729) #11743
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Motivation
tests/functional/help.sh calls nix-* commands with option --help
if nix is built without documentation the option --help throws an error because the man page it wants to display is missing
Context
With disabled docs nix can not be built because of a failing test.
Priorities and Process
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This is an automatic backport of pull request #11729 done by [Mergify](https://mergify.com).