Change or hide the sidebar settings description

Currently the sidebar preference has the following description:

Quickly access bookmarks, tabs from your phone, AI chatbots, and more without leaving your main view.

Which does not work for Tor Browser.

We could change the description, but really our sidebar is only used for vertical tabs and bookmarks, and the former will already enable the sidebar. So I'm not sure what useful description we could give. @donuts @felicia any ideas?

Otherwise, we could just hide the description.