* Add documentation for 2FA with GitHub Mobile * Fix unordered list for GitHub Mobile features * Prefer "logging in to" over "logging into" Co-authored-by: Brian Lovin <brianlovin@github.com> * Indicate that GitHub Mobile is secondary * Further indicate that GitHub Mobile is most like security keys * Prefer "sign in" over "log in" Co-authored-by: Zachary Sierakowski <zacharysierakowski@github.com> * Fix unintended edit Co-authored-by: Zachary Sierakowski <zacharysierakowski@github.com> * Prefer active voice Co-authored-by: hubwriter <hubwriter@github.com> * Add missing punctuation Co-authored-by: hubwriter <hubwriter@github.com> * Fix phrasing of mobile 2FA CTA Co-authored-by: hubwriter <hubwriter@github.com> * Apply suggestions from code review Co-authored-by: hubwriter <hubwriter@github.com> * Prefer active voice Co-authored-by: hubwriter <hubwriter@github.com> * Update "secondary" phrasing for mobile 2FA Co-authored-by: hubwriter <hubwriter@github.com> * Add info about skipping security key Co-authored-by: Joshua Walker <3141202+joshuawalker@users.noreply.github.com> Co-authored-by: Brian Lovin <brianlovin@github.com> Co-authored-by: Zachary Sierakowski <zacharysierakowski@github.com> Co-authored-by: hubwriter <hubwriter@github.com> Co-authored-by: Joshua Walker <3141202+joshuawalker@users.noreply.github.com>