Updating docs for appendText and insertingAdjacentText to reflect implementation.

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index 293a6f928e1b200b31ffaa448024b76e87ae0100..e7681fea5018b590d01caab725aea63a8a0d9693 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -8669,8 +8669,7 @@ abstract class Element extends Node implements ElementTraversal {
   Rect get offset => new Rect(offsetLeft, offsetTop, offsetWidth, offsetHeight);
 
   /**
-   * Adds the specified text as a text node after the last child of this
-   * element.
+   * Adds the specified text after the last child of this element.
    */
   void appendText(String text) {
     this.insertAdjacentText('beforeend', text);