Both pages could be improved but I'd not change much of "Data_Structures, Containers, Collections"; it's mostly an index and I think its structure reflects rather well what it's about, though its contents seem to be a little dated. "Generics" is another kettle of fish: that one really needs a full overhaul.
So go ahead and improve: it's a wiki so if anyone doesn't like what you do (s)he can always undo it or change it to whatever (s)he feels it should be

Just one thing: when adding "content" try to use the best English of which you're capable and, if anything, over-explain any feature/example. The wiki is frequently the first stop for newbies and even mid-level programmers and while it cannot (and shouldn't, IMHO) replace the formal documentation, it should nevetheless be kept/modified to a somewhat "high" standard; as if it were, say, parts of a "course book". You're a software engineer so you know what I mean, I think