George Kalpakas e8a2e81e06 docs: correctly style alert in updating-content-github-ui guide (#41250)
This commit replaces the unknown `is-warning` CSS class from an alert in
the `updating-content-github-ui` guide with the `is-important` CSS class
(that causes the alert to be given an orange-ish background).

PR Close #41250
2021-04-01 11:19:57 -07:00
..