doc: Use new-style command substitution.
Follow up of beaf701d65
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* doc/guix.texi: Replace the shell old-style command substitution with
the new-style one.
Signed-off-by: Julien Lepiller <julien@lepiller.eu>
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@ -3457,7 +3457,7 @@ The typical use case is to define these environment variables in the
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shell:
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@example
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$ eval `guix package --search-paths`
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$ eval $(guix package --search-paths)
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@end example
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@var{kind} may be one of @code{exact}, @code{prefix}, or @code{suffix},
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