message: docs: correctly style alert in `updating-content-github-ui` guide
  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
diff: This topic describes how to submit pull requests to the Angular repository using GitHub's user interface. If you are unfamiliar with [Git](https://git-scm.com/), you might find this process easier for making changes.
  -<div class="alert is-warning">
  +<div class="alert is-important">
  Using the GitHub user interface for updates is recommended only for small changes to one file at a time, such as fixing typos, [updating the review date](guide/reviewing-content) or [updating search keywords](guide/updating-search-keywords).
  