[css-transitions-1] Remove trailing semicolon. Fixes #5592

Author: tabatkins

css-transitions-1/Overview.bs

@@ -250,7 +250,7 @@ Value Definitions {#values}
       </pre>
 
       <div class="prod">
-        <dfn type id="single-transition-property">&lt;single-transition-property&gt;</dfn> = ''transition-property/all'' | <<custom-ident>>;
+        <dfn type id="single-transition-property">&lt;single-transition-property&gt;</dfn> = ''transition-property/all'' | <<custom-ident>>
       </div>
 
       <p>