No worries, I've already updated the ways

Sometimes you put information about an object on a node, sometimes on the area / way itself
For things like toilets it can make sense to put it on the building itself when the information has been there previously.
However this really only makes sense when a building only serves one purpose

Otherwise nodes are more "flexible" and can be modified easier

In the end both work fine so it's usually preferred to update the existing object as to preserve the history of the object :)
The OSM wiki has a lot more information in case you're curious

Happy mapping! 