Correct example code in docs for DivElement class

Closes https://github.com/dart-lang/sdk/pull/53128

GitOrigin-RevId: 52d7b08f3b94439de5752655f06988f63ec24144
Change-Id: I8d87eacc961a7899509c8244f1a0efe4d9a9a8b1
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/318580
Reviewed-by: Srujan Gaddam <srujzs@google.com>
Commit-Queue: Srujan Gaddam <srujzs@google.com>
Reviewed-by: Sigmund Cherem <sigmund@google.com>

sdk/lib/html/dart2js/html_dart2js.dart

@@ -9823,7 +9823,7 @@ class DirectoryReader extends JavaScriptObject {
  * Example usage:
  *
  *     DivElement div = new DivElement();
- *     div.text = 'Here's my new DivElem
+ *     div.text = 'Here is my new DivElem';
  *     document.body.elements.add(elem);
  *
  * See also:

tools/dom/docs.json

@@ -1893,7 +1893,7 @@
         " * Example usage:",
         " *",
         " *     DivElement div = new DivElement();",
-        " *     div.text = 'Here's my new DivElem",
+        " *     div.text = 'Here is my new DivElem';",
         " *     document.body.elements.add(elem);",
         " *",
         " * See also:",