Add outline to low-contrast star icons in ARIA icon font working example (#4293)

Addresses one of the side concerns from
#1016 by modifying the presentation of
one of the examples.

Co-authored-by: Mike Gower <[email protected]>

Author: patrickhlauke

working-examples/aria-icon-font-img-role/index.html

@@ -44,8 +44,8 @@
     .icon-star-bg:before    { content: "\e982"; }
     .icon-star-half:before  { content: "\e983"; }
 
-    .grey { color: #949494; }
-    .yellow { color: #f8c102; }
+    .grey { color: #949494; -webkit-text-stroke: 1px black; }
+    .yellow { color: #f8c102; -webkit-text-stroke: 1px black; }
 
     /* EXAMPLE 2 */