Use full URL to reference issues

app/assets/stylesheets/framework/files.scss

@@ -169,7 +169,7 @@
      */
     &.code {
       padding: 0;
-      -webkit-overflow-scrolling: auto; // Issue #13987
+      -webkit-overflow-scrolling: auto; // See https://gitlab.com/gitlab-org/gitlab-ce/issues/13987
     }
   }
 }

app/assets/stylesheets/pages/commit.scss

@@ -90,7 +90,7 @@
   position: relative;
   font-family: $monospace_font;
   $left: 12px;
-  overflow: hidden; // Issue #13987
+  overflow: hidden; // See https://gitlab.com/gitlab-org/gitlab-ce/issues/13987
   .max-width-marker {
     width: 72ch;
     color: rgba(0, 0, 0, 0.0);