doc: Suggest diffing things with --no-dereference.
* doc/guix.texi (Invoking guix challenge): Add --no-dereference in 'diff' example.
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			@ -4984,7 +4984,7 @@ these lines (@pxref{Invoking guix archive}):
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@example
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$ wget -q -O - http://hydra.gnu.org/nar/@dots{}-git-2.5.0 \
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   | guix archive -x /tmp/git
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$ diff -ur /gnu/store/@dots{}-git.2.5.0 /tmp/git
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$ diff -ur --no-dereference /gnu/store/@dots{}-git.2.5.0 /tmp/git
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@end example
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This command shows the difference between the files resulting from the
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