[tor-wiki-changes] doc/UX/MetricsRedesign edited

[Tor Bug Tracker & Wiki: karsten]

Fix a few typos, make a few edits. 

([diff](https://trac.torproject.org/projects/tor/wiki/doc/UX/MetricsRedesign?action=diff&version=19))

URL: https://trac.torproject.org/projects/tor/wiki/doc/UX/MetricsRedesign?version=19