Users don't understand what "onionize" means on about:tor

We have received a couple of questions about this on our support channels in the last two weeks.

Also see this discussion on the Forum, https://forum.torproject.org/t/onionize-site-explanation/10352. The term "onionize" also happens to be a popular search query on the Tor Forum.

Notes:

1. The tooltip on the 'onionize' toggle reads "Search using the onion site" (checked on Tor Browser 14.0.7).
2. The search bar on about:tor is hardcoded to use DuckDuckGo so toggling on "onionize" is always going to use DuckDuckGo's onion site irrespective of what default search engine is set on the browser.