[bug 572856] Fix docstring lengths for tests

This covers the following apps:

* access
* activity
* announcements
* customercare
* dashboards
* flagit
* forums

This is kind of tedious work, so I think I'm going to stop there for now. However, it's a pretty interesting excuse for going through our test code. We've got some funky looking test code that could probably use some cleaning up.

Cosmetic. Tiny r?