Review and update wiki FAQ pages for 0.1 release

[brson]

These are prominent documentation and haven't received a lot of attention lately.

[kud1ing]

For the issues we have a milestone "1.0 sort of stable". I guess this is different from "0.1"?
If it is, should we have a milestone "0.1"?

[brson]

That's what 'first supported release' is. I'll rename it.

[brson]

The code example on the language FAQ is way out of date. I spent some time looking through the code base for something pretty that showcases major language features but couldn't find anything I liked. Need to write something that uses things like alt pattern matching, record extension, spawning lambdas, other interesting things.

[brson]

I've made a pass over the language FAQ and aside from the code snippet I think it is mostly true.

[brson]

I've edited the other two FAQs as well.

[brson]

Replaced the snippet. Closing.