Bug 15438: [QA Follow-up] Moving POD statement for CanBookBeIssued

Bug 15438: [QA Follow-up] Moving POD statement for CanBookBeIssued

The statement for head3 NB ('nota bene'?) looks like a hash key
in the list of possible return values for $needsconfirmation.
Moved it up and prefixed it with IMPORTANT.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 133e25c56ac79e0b88b89e3b749df338e63a93d0)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit f99f0b7a4a81379adbdc84e8fcae7ac1d6af5fd6)
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>