All footnotes must come after a separator in reStructuredText. Fix the
two files in which this does not happen.
This mistake causes the link to be rendered literally:
...from the venv itself[#distlib]_. If no...
and is caught by Sphinx 8.1.0 as an unreferenced footnote.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>