Updated some more documentation to be more clear.

tools/dom/src/CrossFrameTypes.dart

Index: tools/dom/src/CrossFrameTypes.dart
diff --git a/tools/dom/src/CrossFrameTypes.dart b/tools/dom/src/CrossFrameTypes.dart
index f8ed874334a29cbd60921a902af8010f68d0476a..718b2f6cf8d4f4086193aec7200bc54d7093bb55 100644
--- a/tools/dom/src/CrossFrameTypes.dart
+++ b/tools/dom/src/CrossFrameTypes.dart
@@ -7,13 +7,17 @@ part of html;
 /**
  * Top-level container for a browser tab or window.
  *
- * In a web browser, a [WindowBase] object represents any browser window.  This
- * abstract class contains the state of the window and its relation to other
- * windows, such as which window opened it.
+ * In a web browser, a [WindowBase] object represents any browser window. This
+ * object contains the window's state and its relation to other
+ * windows, such as which window opened this window.
  *
- * **Note:** This class represents any window, whereas [Window] is
+ * **Note:** This class represents any window, while [Window] is
  * used to access the properties and content of the current window or tab.
  *
+ * ## See also
+ *
+ * [Window]
+ *
  * ## Other resources
  *
  * * [DOM Window](https://developer.mozilla.org/en-US/docs/DOM/window) from MDN.