Revert "Improve callout shortcode. (#31802)" (#31871)

This reverts commit 5c6925385e.

site/content/docs/5.0/components/alerts.md

@@ -22,9 +22,9 @@ Alerts are available for any length of text, as well as an optional close button
 {{< /alerts.inline >}}
 {{< /example >}}
 
-{{% callout info %}}
+{{< callout info >}}
 {{< partial "callout-warning-color-assistive-technologies.md" >}}
-{{% /callout %}}
+{{< /callout >}}
 
 ### Link color
 
@@ -70,9 +70,9 @@ You can see this in action with a live demo:
 </div>
 {{< /example >}}
 
-{{% callout warning %}}
+{{< callout warning >}}
 When an alert is dismissed, the element is completely removed from the page structure. If a keyboard user dismisses the alert using the close button, their focus will suddenly be lost and, depending on the browser, reset to the start of the page/document. For this reason, we recommend including additional JavaScript that listens for the `closed.bs.alert` event and programmatically sets `focus()` to the most appropriate location in the page. If you're planning to move focus to a non-interactive element that normally does not receive focus, make sure to add `tabindex="-1"` to the element.
-{{% /callout %}}
+{{< /callout >}}
 
 ## JavaScript behavior