Change example namespace base

This is to avoid collission with the SMW namespaces.
Else we even end up with the same property NS, which is very awkward!

Picked 120 as it seems to not cause problems and is already being used by WMF.

Change-Id: Ib26f654f4f7ed1e58ef4748a1c1b579560899690
Merge "Change example namespace base"