[horde] Suggestion - small change to Horde6 install instructions

[Mike]

I poked around the install section and found the migrate up line you  
are looking for here:

https://wiki.horde.org/Doc/Dev/H6/Installation/InstallBase

I'm not sure where you started and I agree that maybe the instructions  
need updating.

Mike

Quoting Sebastian Arcus <s.arcus at open-t.co.uk>:

> Hello and thank you for all the work put into making Horde 6 happen.
>
> I've just spent a number of hours trying to get Horde 6 working  
> after it kept on crashing with "502 Bad Gateway" as soon as I  
> configured the database access.
>
> Eventually I realised that I needed to populate the database with  
> tables with "horde-db-migrate up" - before trying to navigate any  
> other sections of the admin interface.
>
> Maybe there could be a note to say "don't try anything else before  
> populating the database tables in the section below" - or something  
> like this - to save other slightly clueless people like me from  
> generating noise on this list :)
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