Add examples for creating objects in snapshot.html

[yukulele]

No description provided.

[jordanbrown0]

I thought I already did that, but I was wrong. Thanks.

I have three concerns:

• There are four forms allowed: key=val, [ [ key, val ], ...], obj, and [ [ key ] ], and you only show two of them.
• You're allowed to mix-and-match the forms as desired, and you don't represent that.
• Showing all of the forms, and showing that they can be mixed, seems like it would be more space in the cheat sheet than would be worthwhile.

I have two ideas, neither of which I'm really happy with:

• Don't say anything about argument lists; just say object(...). Leave the details to the manual.
• Show all four forms together, e.g. object(key1=val1, obj, [ [ "key2", val2 ], [ "rmkey" ] ], ...).

[jordanbrown0]

Combined this with my own thoughts and thoughts from #159 into #180.