Bug 25723: (QA follow-up) Silent POD warning

Bug 25723: (QA follow-up) Silent POD warning

I didn't introduce the method that is warned about, but adding POD for
it seemed reasonable and will silence the QA Script warning.

Signed-off-by: Emma Perks <Emma.Perks2@uhb.nhs.uk>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Joonas Kylmälä <joonas.kylmala@helsinki.fi>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 5851539424d04eda0da52ef8744925227dd6ce0f)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>