doc: cookbook: Add 'use-modules' in gexp example.

* doc/guix-cookbook.texi (A Scheme Crash Course): Add 'use-modules' line
in gexp example.
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Ludovic Courtès 2023-08-14 14:57:52 +02:00
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@ -280,6 +280,9 @@ they provide code to be executed during the package build process. They
look like this:
@lisp
(use-modules (guix gexp) ;so we can write gexps
(gnu packages base)) ;for 'coreutils'
;; Below is a G-expression representing staged code.
#~(begin
;; Invoke 'ls' from the package defined by the 'coreutils'