Add notice to redirect when destroying Snapshots

The create action redirect has a notice, so it seems reasonable that the
destroy action would have a similar notice. This should make the app
more usable.

Change-Id: Ifd14bed542f96eba7c2ce9326a3de9a2a248d1ae
Add notice to redirect when destroying Urls

The create and edit action redirects have notices, so it seems
reasonable that the destroy action would have a similar notice. This
should make the app more usable.

Change-Id: Ie3c98a2952201c45858d2a8ef706be32c98ec9b0