Fix publish location of High Availibility Guide

Remove an extra trunk which is not needed anymore, we want to
publish to docs.o.o/high-availiblity-guide.
Now no guide sets "target" anymore in manuals.yam.

Change-Id: Idf712124f0703259f10ac60e557bc1fb4250bbc5
Merge "Fix publish location of High Availibility Guide"