[Connecting to Tor] Add the command line option to view logs

An user reported on the #tor IRC channel that they couldn't launch the Tor Browser and couldn't obtain the logs either. Currently, we direct users to two ways of getting the Tor logs in the 'Connecting to Tor' support page, i.e. with the option to 'copy Tor log to Clipboard' or to navigate through the hamburger menu within the browser. We should add the option of launching the Tor Browser in terminal with the verbose flag, i.e. ./start-tor-browser.desktop --verbose to get the logs right in the terminal (this is what helped the user to diagnose the problem in this case).