Align with DOM's children changed steps

As indicated by whatwg/dom#800 and its tests, more than Text node changes are observed by consumers.

Author: annevk

source

@@ -3211,7 +3211,7 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
      <li>The <dfn data-x="concept-node-insert-ext" data-x-href="https://dom.spec.whatwg.org/#concept-node-insert-ext">insertion steps</dfn>,
              <dfn data-x="concept-node-remove-ext" data-x-href="https://dom.spec.whatwg.org/#concept-node-remove-ext">removing steps</dfn>,
              <dfn data-x="concept-node-adopt-ext" data-x-href="https://dom.spec.whatwg.org/#concept-node-adopt-ext">adopting steps</dfn>, and
-             <dfn data-x-href="https://dom.spec.whatwg.org/#concept-node-text-change-ext">child text content change steps</dfn> hooks for elements</li>
+             <dfn data-x-href="https://dom.spec.whatwg.org/#concept-node-children-changed-ext">children changed steps</dfn> hooks for elements</li>
      <li>The <dfn data-x="concept-element-attributes-change" data-x-href="https://dom.spec.whatwg.org/#concept-element-attributes-change">change</dfn>, <dfn data-x="concept-element-attributes-append" data-x-href="https://dom.spec.whatwg.org/#concept-element-attributes-append">append</dfn>, <dfn data-x="concept-element-attributes-remove" data-x-href="https://dom.spec.whatwg.org/#concept-element-attributes-remove">remove</dfn>, <dfn data-x="concept-element-attributes-replace" data-x-href="https://dom.spec.whatwg.org/#concept-element-attributes-replace">replace</dfn>, and <dfn data-x="concept-element-attributes-set-value" data-x-href="https://dom.spec.whatwg.org/#concept-element-attributes-set-value">set value</dfn> algorithms for attributes</li>
      <li>The <dfn data-x="concept-element-attributes-change-ext" data-x-href="https://dom.spec.whatwg.org/#concept-element-attributes-change-ext">attribute change steps</dfn> hook for attributes</li>
      <li>The <dfn data-x-href="https://dom.spec.whatwg.org/#concept-element-attribute">attribute list</dfn> concept</li>
@@ -15206,7 +15206,7 @@ interface <dfn>HTMLStyleElement</dfn> : <span>HTMLElement</span> {
    parser</span> or <span>XML parser</span>, and it <span>becomes connected</span> or <span
    data-x="becomes disconnected">disconnected</span>.</p></li>
 
-   <li><p>The element's <span>child text content change steps</span> run.</p></li>
+   <li><p>The element's <span>children changed steps</span> run.</p></li>
   </ul>
 
   <p>The <dfn data-export="">update a <code>style</code> block</dfn> algorithm is as follows:</p>
@@ -51404,8 +51404,8 @@ interface <dfn>HTMLTextAreaElement</dfn> : <span>HTMLElement</span> {
   elements must propagate the <span data-x="concept-textarea-raw-value">raw value</span> and <span
   data-x="concept-fe-dirty">dirty value flag</span> from the node being cloned to the copy.</p>
 
-  <p>The <span>child text content change steps</span> for <code>textarea</code> elements must, if
-  the element's <span data-x="concept-fe-dirty">dirty value flag</span> is false, set the element's
+  <p>The <span>children changed steps</span> for <code>textarea</code> elements must, if the
+  element's <span data-x="concept-fe-dirty">dirty value flag</span> is false, set the element's
   <span data-x="concept-textarea-raw-value">raw value</span> to its <span>child text
   content</span>.</p>