Update techniques/html/H4.html

Author: patrickhlauke

techniques/html/H4.html

@@ -78,7 +78,7 @@
       <section class="example">
 
             <p>
-								       <code>Tabindex</code> values need not be sequential nor must they begin with any
+								       <code>tabindex</code> values need not be sequential nor must they begin with any
                 particular value. The values do not have to be unique. Elements that have identical
                   <code>tabindex</code> values are navigated in the order they appear in the
                 character stream. </p>