qapi/block-core.json: Fix nbd-server-start docs

Commit eed8b6917832 added some new text to the nbd-server-start
documentation in the wrong place.  Since this is after the 'Returns:'
line it's parsed as if it were part of the documentation of the
"Returns:' information.  Move it up to join the rest of the
"documentation of the type as a whole" doc text.

This doesn't look odd in the current HTML rendering, but the
new QAPI-to-rST handling will complain about the indent level
of the lines not matching up with the 'Returns:' line.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20200810195019.25427-4-peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

0 files changed, 0 insertions, 0 deletions