Wrap the throttled warning in a warningbox div

Currently, the message informing that some actions have been disabled is
quite impossible to notice at a first glance, since it's a bit confused
with other form elements. However it actually is a warning and needs to
be treated as that.

Change-Id: I0d851333f8da200fb0b9b0c7d05ccd1f63e9e948

includes/Views/AbuseFilterViewEdit.php

@@ -518,9 +518,11 @@ class AbuseFilterViewEdit extends AbuseFilterView {
 				);
 
 				$flags .= $out->parse(
-					$this->msg( 'abusefilter-edit-throttled-warning' )
-						->plaintextParams( $lang->commaList( $throttledActions ) )
-						->text()
+					Html::warningBox(
+						$this->msg( 'abusefilter-edit-throttled-warning' )
+							->plaintextParams( $lang->commaList( $throttledActions ) )
+							->text()
+					)
 				);
 			}
 		}