Bug 29764: Fix incorrect EmbedItems RecordProcessor filter POD
This patch makes the usage POD for the EmbedItems filter actually be
usable. The filter is used in opac-ISBDdetail.pl and the POD is updated
to how it is used there.
Not much to test.
Signed-off-by: David Cook <dcook@prosentient.com.au> Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de> Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com> Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>