[bug#34625] [PATCH] Documentation: Update `guix challenge` diffing

[mikadoZero]

Attached is a patch that updates the manual sections `Invoking guix challenge` 
and `Invoking guix archive`.  The update involves changing a command in both 
sections to one that I verified worked as part of my submission of `guix 
challenge` diffs for bug#34597.  The commands that are replaces did not work 
for me.  There is also a cross reference added to the `Invoking guix challenge` 
in the relevant part of `Invoking guix archive`.

0001-Documentation-Update-guix-challenge-diffing.patch
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