Editorial: revise redundant role declaration example (#482)

* Editorial: revise redundant role declaration example closes #478
* remove errant `;` closes #479

Author: scottaohara

index.html

@@ -318,12 +318,11 @@ 
           <main role="Main">...</main>
         pre>
         <p>
-          The following uses a `role=list` on an [^ul^] element. This is
-          generally unnecessary, because the `ul` element is implicitly exposed
-          as a `role=list`. However, some user agents suppress a list's
-          implicit ARIA semantics if list markers are removed. Authors can
-          use `role=list` to reinstate the role if necessary, though this
-          practice would generally not be recommended, otherwise.
+          The following uses a `role=list` on an [^ul^] element. As the `ul` element has an implicit role of `list`, 
+          explicitly adding the role would generally be considered redundant. However, some user agents suppress a list's
+          implicit ARIA semantics if the list markers are removed from the visual presentation of the list items. 
+          Generally the redundant declaration of an element's implicit role would not be recommended, but in specific situations
+          such as this, and where the role is necessary to expose, authors can explicitly add the role.
         p>
         <pre class="HTML example" title="Redundant role on list">
           <!-- Generally avoid doing this! -->
@@ -374,7 +373,7 @@ Adhere to the rules of ARIA
         p>
         <pre class="HTML example" title="Do not specify elements as generic">
           <!-- Avoid doing this! -->
-          <article role="generic" ...>...</article>;
+          <article role="generic" ...>...</article>
         pre>
         <p>
           Additionally, ARIA specifically mentions in <a data-cite="wai-aria-1.2/#host_general_conflict">Conflicts with Host Language Semanticsa>