doc: emacs: Clarify 'guix-use-substituse' and 'guix-dry-run'.

Reported by apteryx on #guix.

* doc/emacs.texi (Emacs Build Options): Mention the variable value when describe
the effects of 'guix-use-substitute' and 'guix-dry-run'.
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宋文武 2016-10-23 12:49:51 +08:00
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@ -417,12 +417,12 @@ this variable, for example:
@end example
@item guix-use-substitutes
Has the same meaning as @code{--no-substitutes} option (@pxref{Invoking
guix build}).
If nil, has the same meaning as @code{--no-substitutes} option
(@pxref{Invoking guix build}).
@item guix-dry-run
Has the same meaning as @code{--dry-run} option (@pxref{Invoking guix
build}).
If non-nil, has the same meaning as @code{--dry-run} option
(@pxref{Invoking guix build}).
@end table