[tor-talk] Updated "Why JavaScript is enabled" FAQ entry

[Roger Dingledine]

Hi folks,

I rewrote our two FAQ entries on JavaScript-in-TBB, and merged them
into one:

https://www.torproject.org/docs/faq#TBBJavaScriptEnabled

Did I leave out any important points, or are there ways to make the
issues clearer?

(Please don't turn this into a "you should change the default you
idiots" thread, but please do point out if I've made one of the points
inadequately. Hopefully that's a distinction that will work here.)

Thanks,
--Roger