docs/devel/qapi-code-gen: Tweak doc comment whitespace

Missed in commit a937b6aa739 (qapi: Reformat doc comments to conform
to current conventions).

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240205074709.3613229-3-armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
1 file changed