[Koha] Catalog Search Relevance Ranking / Dead link in manual

[Katrin Fischer]

> The actual relevance ranking is done within Zebra, you will find the 
> "Zebra - User's Guide and Reference" here (unfortunately the link to 
> this guide in the Koha manual is dead):
> * http://www.indexdata.com/zebra/doc/
>
> For relevance ranking start here:
> * http://www.indexdata.com/zebra/doc/administration-ranking.html
>
Hi Michael and all,

please report any problems with the manual that you spot or know of. We 
have a pad that you can just type into, no registration required:

https://annuel2.framapad.org/p/KohaManualTodo

Also feel free to submit a patch directly, instructions are here:

https://wiki.koha-community.org/wiki/Editing_the_Koha_Manual

You can also send us text directly to format and include. I would love 
if we could add more information about how the relevance ranking works!

Katrin