Update core-aam/index.html

Co-authored-by: Melanie Sumner <melaniersumner@gmail.com>

core-aam/index.html

@@ -9853,7 +9853,7 @@ <h3>Group Position</h3>
             >, <a class="property-reference" href="#aria-posinset"><code>aria-posinset</code></a
             >, and <a class="property-reference" href="#aria-setsize"><code>aria-setsize</code></a> are all 1-based. When the [=ARIA/property=] is not present or is &quot;0&quot;, it indicates the
             property is not computed or not supported.</p>
-	  <p>If the <a class="property-reference" href="#aria-level"><code>aria-level</code></a> or <a class="property-reference" href="#aria-posinset"><code>aria-posinset</code> properties are specified by the author as either &quot;0&quot; or a negative number, [=user agents=] SHOULD use &quot;1&quot; instead.
+	  <p>If the <a class="property-reference" href="#aria-level"><code>aria-level</code></a> or <a class="property-reference" href="#aria-posinset"><code>aria-posinset</code></a> properties are specified by the author as either &quot;0&quot; or a negative number, [=user agents=] SHOULD use &quot;1&quot; instead.
           </p>
 	  <p>
 	   If the <a class="property-reference" href="#aria-setsize"><code>aria-setsize</code></a> property is specified by the author as either &quot;0&quot; or a negative number, the author is indicating the set is an indeterminate size. [=User agents=] MUST NOT calculate the set size of an indeterminate set.