Same comment on this relation. 

Hints:
Your probably reading this via some email message ... so 
You can view the changeset on https://www.openstreetmap.org/changeset/146731774 
That gives you all the ways, relations and nodes that were entered or changed .. so you can see then there.
Then you can click on them to see each one .. such as the relation 
https://www.openstreetmap.org/relation/17086425

And so on for each thing. 

For information on tags and relations the osmwiki is a reasonable guide. See 
https://wiki.openstreetmap.org/wiki/Relation:multipolygon#Multipolygon_created_by_only_one_polygon
Note: engage brain, the wiki reflects the view of the person who last edited it, may not be a consensus view .. if you have concerns see the discussion page - top left provides a link to it on all the osmwiki pages. 

Keep mapping. 

