buildfix: update texinfo menu

Build error message:
qemu-doc.texi:34: node `Top' lacks menu item for `Recently removed features' despite being its Up target

Fixes: 3264ffced3 ("dirty-bitmaps: remove deprecated autoload parameter")
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Message-id: 20191023101956.19120-1-kraxel@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

qemu-doc.texi

@@ -44,6 +44,7 @@
 * Security::
 * Implementation notes::
 * Deprecated features::
+* Recently removed features::
 * Supported build platforms::
 * License::
 * Index::