Typo updates to Teleport quick start guide (#2911)
Typo updates to Teleport quick start guide (#2911)

* Typo updates to Teleport quick start guide

* Updated TTL for login back to 12 hours. TTL for signup token was 1 hour.

gravitational/teleport,gravitational/teleport,gravitational/teleport,gravitational/teleport,gravitational/teleport,gravitational/teleport