main/fish: make util-linux a dep of fish-doc and add a README
It is required to have util-linux to use the `help` command in any of the builtins fish provides as the internal `__fish_print_help` function uses the `ul` program that `util-linux` provides. `__fish_print_help` also returns early if there are no manpages installed which are present in `fish-doc` so can we can kludingly deal with this by tying the `util-linux` dependency to the -doc subpackage. This is not perfect as many users that want `fish-doc` don't want `util-linux` but it is better than giving a free `util-linux` dependency to anyone that installs `fish`
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ppc64le
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ci-build
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docker-alpine
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