Bug 31302: Fix spelling in sample_notices.yml

Bug 31302: Fix spelling in sample_notices.yml

Test plan:
1. Apply patch
2. Confirm 'URL(s)', rather than urls(s), is in the line:
You can download the scanned materials via the following URL(s)

Sponsored-by: Catalyst IT, New Zealand
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit b3d8941c34887b34c69edac8f33b7de179d96267)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
(cherry picked from commit 528bb4af5390cbaa145bf7ef8c2a27e0e59e7587)
Signed-off-by: Arthur Suzuki <arthur.suzuki@biblibre.com>