qapi: fix colon in Since tag section As described in docs/devel/qapi-code-gen.rst line 998, there should be no space between "Since" and ":". Signed-off-by: Victor Toso <victortoso@redhat.com> Message-ID: <20241217091504.16416-1-victortoso@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>