update text definition of bot:containsElement and bot:containsZone

[mathib]

According to the comment by @pchampin on another issue followed by the comment of @maximelefrancois86 regarding the ISWJ paper of BOT, the definition of bot:containsZone and bot:containsElement should be updated, to indicate that this relation is only valid when the zone or resp. element is entirely contained in the other zone.

I would propose to add the following line to the rdfs:comment of bot:containsZone:

The relation bot:containsZone is only valid between two spatial building zones if the smallest zone is entirely contained in the other zone.

I would propose to add the following line to the rdfs:comment of bot:containsElement:

The relation bot:containsElement is only valid between a spatial building zone and a building element if the element is entirely contained in the zone.