Bug 20661: (QA follow-up) Add POD for output_and_exit

Bug 20661: (QA follow-up) Add POD for output_and_exit

Resolve:
 FAIL   C4/Output.pm
   FAIL   pod
                *** ERROR: Apparent command =cut not preceded by blank line  in file C4/Output.pm
   FAIL   pod coverage
                POD is missing for output_and_exit

Test plan:
Run QA tools again.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit ef58eff737b2fdcb4f97c8667e2f83e7f7aa70c7)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>