[PATCH] Fix typo (Re: Feedback of the GNU Guix manual)

[Matt]

We're working through a list of feedback one item at a time:
https://lists.gnu.org/archive/html/guix-devel/2024-01/msg00117.html

We have completed the first four items.

The next item reported is:

#+begin_quote
3.8 Installing Guix in a Virtual Machine

L25 in an vm should be in a vm
#+end_quote

This is a nice, easy fix, good for me to practice getting the commit formatting 
correct :)

0001-doc-Fix-typo.patch
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