Apply suggestion from @ArvinJ-H

Author: ArvinJ-H

modules/ROOT/partials/configuration/a11ychecker_allow_decorative_images.adoc

@@ -31,6 +31,9 @@ Any of these approaches explicitly tells assistive technologies to ignore these
 
 <!-- Using both approaches -->
 <img src="pattern.png" role="presentation" alt="" />
+
+<!-- Using empty alt and title attribute -->
+<img src="decorative-border.png" alt="" title=""/>
 ----
 
 === Example of an Informative Image (non-decorative):