Use better words for the Tor Network description in the onboarding

The translator dfiguera suggested in Weblate a better wording for the Tor Network description in the onboarding.

assigned to @emmapeel

mentioned in merge request !525 (merged)

closed

mentioned in merge request !526 (closed)

mentioned in issue tor-browser-build#40715 (closed)

marked this issue as related to tor-browser-build#40724 (closed)

marked this issue as related to tor-browser-build#40725 (closed)

added Desktop Task labels