Update index.html

per @cookiecrook review, changing a couple more instances where 'accessible name' should be used instead of 'subtree'

index.html

@@ -16401,7 +16401,7 @@ <h4>`fieldset` Element Accessible Name Computation</h4>
             If the `fieldset` element has an <a data-cite="wai-aria-1.2/#aria-label">`aria-label`</a> or an <a data-cite="wai-aria-1.2/#aria-labelledby">`aria-labelledby`</a> attribute the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is to be calculated using the algorithm defined in <a href="" class="accname">Accessible Name and Description: Computation and API Mappings</a>.
           </li>
           <li>
-            If the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is still empty, then: if the `fieldset` element has a <a href="https://dom.spec.whatwg.org/#concept-tree-child">child</a> that is a <code>legend</code> element, then use the subtree of the first such element.
+            If the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is still empty, then: if the `fieldset` element has a <a href="https://dom.spec.whatwg.org/#concept-tree-child">child</a> that is a <code>legend</code> element, then use the accessible name of the first such element.
           </li>
           <li>
             If the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is still empty, then:, if the `fieldset` element has a `title` attribute, then use that attribute.
@@ -16530,7 +16530,7 @@ <h4>`table` Element Accessible Name Computation</h4>
             If the `table` element has an <a data-cite="wai-aria-1.2/#aria-label">`aria-label`</a> or an <a data-cite="wai-aria-1.2/#aria-labelledby">`aria-labelledby`</a> attribute the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is to be calculated using the algorithm defined in <a href="" class="accname">Accessible Name and Description: Computation and API Mappings</a>.
           </li>
           <li>
-            If the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is still empty, then: if the `table` element has a <a href="https://dom.spec.whatwg.org/#concept-tree-child">child</a> that is a <code>caption</code> element, then use the subtree of the first such element.
+            If the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is still empty, then: if the `table` element has a <a href="https://dom.spec.whatwg.org/#concept-tree-child">child</a> that is a <code>caption</code> element, then use the accessible name of the first such element.
           </li>
           <li>
             If the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is still empty, then: if the `table` element has a `title` attribute, then use that attribute.