doc: fix show-hide sample in notification devref
doc: fix show-hide sample in notification devref

The new doc template includes jquery too late and therefore showing
and hindig notification samples and auto hiding them by default doesn't
work.

This patch loads the jquery lib earlier for the notification devref.

Closes-Bug: #1713974
Closes-Bug: #1714363
Change-Id: I07db4755c69d493e591761578d1077bb44acda41

klmitch/nova,rahulunair/nova,mikalstill/nova,klmitch/nova,mikalstill/nova,rahulunair/nova,mikalstill/nova,mahak/nova,rahulunair/nova,gooddata/openstack-nova,openstack/nova,klmitch/nova,gooddata/openstack-nova,klmitch/nova,gooddata/openstack-nova,gooddata/openstack-nova,openstack/nova,phenoxim/nova,openstack/nova,mahak/nova,mahak/nova,phenoxim/nova