Merge pull request #15584 from KevinJannis/patch-2

Added blank lines between selectors for alerts

less/alerts.less

@@ -18,6 +18,7 @@
     // Specified for the h4 to prevent conflicts of changing @headings-color
     color: inherit;
   }
+  
   // Provide class for links that match alerts
   .alert-link {
     font-weight: @alert-link-font-weight;
@@ -28,6 +29,7 @@
   > ul {
     margin-bottom: 0;
   }
+  
   > p + p {
     margin-top: 5px;
   }
@@ -57,12 +59,15 @@
 .alert-success {
   .alert-variant(@alert-success-bg; @alert-success-border; @alert-success-text);
 }
+
 .alert-info {
   .alert-variant(@alert-info-bg; @alert-info-border; @alert-info-text);
 }
+
 .alert-warning {
   .alert-variant(@alert-warning-bg; @alert-warning-border; @alert-warning-text);
 }
+
 .alert-danger {
   .alert-variant(@alert-danger-bg; @alert-danger-border; @alert-danger-text);
 }