qapi: Update docs given recent event, spacing fixes
Commit
21cd70d added event support but didn't document what the
generated code looks like. Commit
05dfb26 removed some unwanted
spaces in the generated code, but didn't reflect those changes
into the documentation. Finally, the docs start with a big
disclaimer about QMP not using QAPI yet, which feels rather stale.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>