Revise first sentence to communicate that the author doesn't always have to specify

Author: mcking65

aria-practices.html

@@ -6738,7 +6738,7 @@ <h3>Range properties with spin buttons</h3>
   <section id="aria-level">
     <h2>Describing Hierarchical Structure with <code>aria-level</code></h2>
     <p>
-      When elements have a hierarchical relationship, such as headings of nested sections or data in tree structures, <a href="#aria-level" class="property-reference">aria-level</a> is used to communicate an element's level within the hierarchy to assistive technologies.
+      When elements have a hierarchical relationship, such as headings of nested sections or data in tree structures, the value of <a href="#aria-level" class="property-reference">aria-level</a> communicates an element's level within the hierarchy to assistive technologies.
       The value of <code>aria-level</code> is numeric, with <code>1</code> indicating the top level of the structure.
       The number increases for each level of nesting.
     </p>