Merge pull request #10749 from ZDroid/patch-2

@headingsColor → @headings-color

less/alerts.less

@@ -15,7 +15,7 @@
   // Headings for larger alerts
   h4 {
     margin-top: 0;
-    // Specified for the h4 to prevent conflicts of changing @headingsColor
+    // Specified for the h4 to prevent conflicts of changing @headings-color
     color: inherit;
   }
   // Provide class for links that match alerts