Attempting to modify a review request's close description and then

reloading the page gave the impression that the message didn't save.

This was because the timestamp for the accompanying ChangeDescription

wasn't being factored into the ETag for the page. A shift-reload would

fix this, as would any change affecting other pieces of the ETag.
We now include the timestamp for the ChangeDescription as part of the

ETag, ensuring that any reloads will show the new content immediately.

Unit tests pass.
Manually tested that old content was no longer being cached on reload.