Bug 13405 - System information has misleading information about indexing mode

Bug 13405 - System information has misleading information about indexing mode

With this patch when <zebra_bib_index_mode> or <zebra_auth_index_mode> are set to 'grs1'
it appears a link to https://wiki.koha-community.org/wiki/Switching_to_dom_indexing
instead of a misleading information.

To test:
a)Insert 'grs1' in <zebra_bib_index_mode> or <zebra_auth_index_mode> (file koha-conf.xml)
b)It appers a  misleading warning
c)Apply the patch
d)It appears a link to https://wiki.koha-community.org/wiki/Switching_to_dom_indexing.

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Katrin Fischer  <katrin.fischer@bsz-bw.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>