[Bug 911833] Change wording on answers page.

Change the wording at the bottom of the answers page that stops encouraging anonymous users to post, as this probably doesn't add much to the conversation.

r?

![shot_31517](https://f.cloud.github.com/assets/305049/1119383/6331719a-1a74-11e3-9518-b1548239be9a.png)